diff --git a/src/opt/maxlex.cpp b/src/opt/maxlex.cpp
index 82eee6f5e..fa97359d0 100644
--- a/src/opt/maxlex.cpp
+++ b/src/opt/maxlex.cpp
@@ -186,7 +186,7 @@ namespace opt {
     public:
 
         maxlex(maxsat_context& c, unsigned id, vector<soft>& s):
-            maxsmt_solver_base(c, s),
+            maxsmt_solver_base(c, s, id),
             m(c.get_manager()),
             m_c(c) {
             // ensure that soft constraints are sorted with largest soft constraints first.
diff --git a/src/opt/maxres.cpp b/src/opt/maxres.cpp
index 0d1bf2394..135e0f80e 100644
--- a/src/opt/maxres.cpp
+++ b/src/opt/maxres.cpp
@@ -95,7 +95,6 @@ private:
         expr_ref_vector const& soft() override { return i.m_asms; }
     };
 
-    unsigned         m_index;
     stats            m_stats;
     expr_ref_vector  m_B;
     expr_ref_vector  m_asms;    
@@ -132,8 +131,7 @@ public:
     maxres(maxsat_context& c, unsigned index,
            vector<soft>& soft,
            strategy_t st):
-        maxsmt_solver_base(c, soft),
-        m_index(index), 
+        maxsmt_solver_base(c, soft, index),
         m_B(m), m_asms(m), m_defs(m),
         m_new_core(m),
         m_mus(c.get_solver()),
diff --git a/src/opt/maxsmt.cpp b/src/opt/maxsmt.cpp
index dab9ae445..a3d5f2f45 100644
--- a/src/opt/maxsmt.cpp
+++ b/src/opt/maxsmt.cpp
@@ -35,10 +35,10 @@ Notes:
 
 namespace opt {
 
-    maxsmt_solver_base::maxsmt_solver_base(
-        maxsat_context& c, vector<soft>& s):
+    maxsmt_solver_base::maxsmt_solver_base(maxsat_context& c, vector<soft>& s, unsigned index):
         m(c.get_manager()), 
         m_c(c),
+        m_index(index),
         m_soft(s),
         m_assertions(m),
         m_trail(m) {
@@ -91,18 +91,17 @@ namespace opt {
                 m_upper += s.weight;
         }
 
-        return true;
+        // return true;
 
         preprocess pp(s());
         rational lower(0);
         bool r = pp(m_soft, lower);
 
-
-        if (lower != 0)
-            m_adjust_value->set_offset(lower + m_adjust_value->get_offset());
+        m_c.add_offset(m_index, lower);
+        m_upper -= lower;
         
         TRACE("opt", 
-              tout << "upper: " << m_upper << " assignments: ";
+              tout << "lower " << lower << " upper: " << m_upper << " assignments: ";
               for (soft& s : m_soft) tout << (s.is_true()?"T":"F");              
               tout << "\n";);
         return r;
@@ -169,8 +168,8 @@ namespace opt {
 
     void maxsmt_solver_base::trace_bounds(char const * solver) {
         IF_VERBOSE(1, 
-                   rational l = (*m_adjust_value)(m_lower);
-                   rational u = (*m_adjust_value)(m_upper);
+                   rational l = m_c.adjust(m_index, m_lower);
+                   rational u = m_c.adjust(m_index, m_upper);
                    if (l > u) std::swap(l, u);
                    verbose_stream() << "(opt." << solver << " [" << l << ":" << u << "])\n";);                
     }
@@ -196,10 +195,10 @@ namespace opt {
             m_msolver = mk_primal_dual_maxres(m_c, m_index, m_soft);
         }
         else if (maxsat_engine == symbol("wmax")) {
-            m_msolver = mk_wmax(m_c, m_soft);
+            m_msolver = mk_wmax(m_c, m_soft, m_index);
         }
         else if (maxsat_engine == symbol("sortmax")) {
-            m_msolver = mk_sortmax(m_c, m_soft);
+            m_msolver = mk_sortmax(m_c, m_soft, m_index);
         }
         else {
             auto str = maxsat_engine.str();
@@ -209,7 +208,6 @@ namespace opt {
 
         if (m_msolver) {
             m_msolver->updt_params(m_params);
-            m_msolver->set_adjust_value(*m_adjust_value);
             is_sat = l_undef;
             try {
                 is_sat = (*m_msolver)();
@@ -233,13 +231,6 @@ namespace opt {
         return is_sat;
     }
 
-    void maxsmt::set_adjust_value(adjust_value& adj) { 
-        m_adjust_value = &adj; 
-        if (m_msolver) {
-            m_msolver->set_adjust_value(adj);            
-        }
-    }
-
     void maxsmt::reset_upper() {
         if (m_msolver) {
             m_msolver->reset_upper();
@@ -268,7 +259,7 @@ namespace opt {
             rational q = m_msolver->get_lower();
             if (q > r) r = q;
         }
-        return (*m_adjust_value)(r);
+        return m_c.adjust(m_index, r);
     }
 
     rational maxsmt::get_upper() const {
@@ -277,7 +268,7 @@ namespace opt {
             rational q = m_msolver->get_upper();
             if (q < r) r = q; 
         }
-        return (*m_adjust_value)(r);
+        return m_c.adjust(m_index, r);
     }
 
     void maxsmt::update_lower(rational const& r) {
@@ -370,6 +361,7 @@ namespace opt {
         model_ref  m_model;
         ref<generic_model_converter> m_fm; 
         symbol m_maxsat_engine;
+        vector<rational> m_offsets;
     public:
         solver_maxsat_context(params_ref& p, solver* s, model * m): 
             m_params(p), 
@@ -394,6 +386,14 @@ namespace opt {
         bool verify_model(unsigned id, model* mdl, rational const& v) override { return true; };
         void set_model(model_ref& _m) override { m_model = _m; }
         void model_updated(model* mdl) override { } // no-op
+        rational adjust(unsigned id, rational const& r) override {
+            m_offsets.reserve(id+1);
+            return r + m_offsets[id];
+        }
+        void add_offset(unsigned id, rational const& r) override {
+            m_offsets.reserve(id+1);
+            m_offsets[id] += r;
+        }
     };
 
     lbool maxsmt_wrapper::operator()(vector<std::pair<expr*,rational>>& soft) {
diff --git a/src/opt/maxsmt.h b/src/opt/maxsmt.h
index 5a3dc4ca8..b0ae5eeb1 100644
--- a/src/opt/maxsmt.h
+++ b/src/opt/maxsmt.h
@@ -34,8 +34,6 @@ namespace opt {
     class maxsat_context;
 
     class maxsmt_solver {
-    protected:
-        adjust_value* m_adjust_value = nullptr;
     public:        
         virtual ~maxsmt_solver() {}
         virtual lbool operator()() = 0;
@@ -45,7 +43,6 @@ namespace opt {
         virtual void collect_statistics(statistics& st) const = 0;
         virtual void get_model(model_ref& mdl, svector<symbol>& labels) = 0;
         virtual void updt_params(params_ref& p) = 0;
-        void set_adjust_value(adjust_value& adj) { m_adjust_value = &adj; }
 
     };
 
@@ -67,7 +64,8 @@ namespace opt {
     class maxsmt_solver_base : public maxsmt_solver {
     protected:
         ast_manager&     m;
-        maxsat_context&  m_c;        
+        maxsat_context&  m_c;
+        unsigned         m_index;
         vector<soft>&    m_soft;
         expr_ref_vector  m_assertions;
         expr_ref_vector  m_trail;
@@ -78,7 +76,7 @@ namespace opt {
         params_ref       m_params;           // config
 
     public:
-        maxsmt_solver_base(maxsat_context& c, vector<soft>& soft);
+        maxsmt_solver_base(maxsat_context& c, vector<soft>& soft, unsigned index);
         
         ~maxsmt_solver_base() override {}
         rational get_lower() const override { return m_lower; }
@@ -128,7 +126,6 @@ namespace opt {
         expr_ref_vector  m_answer;
         rational         m_lower;
         rational         m_upper;
-        adjust_value*    m_adjust_value = nullptr;
         model_ref        m_model;
         svector<symbol>  m_labels;
         params_ref       m_params;
@@ -137,7 +134,6 @@ namespace opt {
         lbool operator()();
         void updt_params(params_ref& p);
         void add(expr* f, rational const& w); 
-        void set_adjust_value(adjust_value& adj);
         unsigned size() const { return m_soft.size(); }
         expr* operator[](unsigned idx) const { return m_soft[idx].s; }
         rational weight(unsigned idx) const { return m_soft[idx].weight; }
diff --git a/src/opt/opt_context.cpp b/src/opt/opt_context.cpp
index 8848b61c9..25982e89e 100644
--- a/src/opt/opt_context.cpp
+++ b/src/opt/opt_context.cpp
@@ -398,7 +398,7 @@ namespace opt {
     }
 
     void context::set_model(model_ref& m) { 
-        m_model = m; 
+        m_model = m;
         opt_params optp(m_params);
         if (optp.dump_models() && m) {
             model_ref md = m->copy();
@@ -930,7 +930,8 @@ namespace opt {
     bool context::is_maxsat(expr* fml, expr_ref_vector& terms, 
                             vector<rational>& weights, rational& offset, 
                             bool& neg, symbol& id, expr_ref& orig_term, unsigned& index) {
-        if (!is_app(fml)) return false;
+        if (!is_app(fml))
+            return false;
         neg = false;
         orig_term = nullptr;
         index = 0;
@@ -1105,8 +1106,7 @@ namespace opt {
                 obj.m_weights.append(weights);
                 obj.m_adjust_value.set_offset(offset);
                 obj.m_adjust_value.set_negate(neg);
-                m_maxsmts.find(id)->set_adjust_value(obj.m_adjust_value);
-                TRACE("opt", tout << "maxsat: " << id << " offset:" << offset << "\n";
+                TRACE("opt", tout << "maxsat: " << neg << " " << id << " offset: " << offset << "\n";
                       tout << terms << "\n";);
             }
             else if (is_maximize(fml, tr, orig_term, index)) {
@@ -1158,7 +1158,14 @@ namespace opt {
 #endif
     }
 
+    rational context::adjust(unsigned id, rational const& v) {
+        return m_objectives[id].m_adjust_value(v);
+    }
 
+    void context::add_offset(unsigned id, rational const& o) {
+        m_objectives[id].m_adjust_value.add_offset(o);
+    }
+    
     bool context::verify_model(unsigned index, model* md, rational const& _v) {
         rational r;
         app_ref term = m_objectives[index].m_term;
@@ -1341,24 +1348,21 @@ namespace opt {
                 break;
             }
             case O_MAXSMT: {
-                bool ok = true;
-                for (unsigned j = 0; ok && j < obj.m_terms.size(); ++j) {
+                for (unsigned j = 0; j < obj.m_terms.size(); ++j) {
                     val = (*m_model)(obj.m_terms[j]);
                     TRACE("opt", tout << mk_pp(obj.m_terms[j], m) << " " << val << "\n";);
-                    if (!m.is_true(val)) {
+                    if (!m.is_true(val)) 
                         r += obj.m_weights[j];
-                    }
                 }
-                if (ok) {
-                    maxsmt& ms = *m_maxsmts.find(obj.m_id);
-                    if (is_lower) {
-                        ms.update_upper(r);
-                        TRACE("opt", tout << "update upper from " << r << " to " << ms.get_upper() << "\n";);                        
-                    }
-                    else {
-                        ms.update_lower(r);
-                        TRACE("opt", tout << "update lower from " << r << " to " << ms.get_lower() << "\n";);                        
-                    }
+
+                maxsmt& ms = *m_maxsmts.find(obj.m_id);
+                if (is_lower) {
+                    ms.update_upper(r);
+                    TRACE("opt", tout << "update upper from " << r << " to " << ms.get_upper() << "\n";);           
+                }
+                else {
+                    ms.update_lower(r);
+                    TRACE("opt", tout << "update lower from " << r << " to " << ms.get_lower() << "\n";);           
                 }
                 break;
             }
diff --git a/src/opt/opt_context.h b/src/opt/opt_context.h
index 1e950174a..c02689a38 100644
--- a/src/opt/opt_context.h
+++ b/src/opt/opt_context.h
@@ -57,6 +57,8 @@ namespace opt {
         virtual smt::context& smt_context() = 0;    // access SMT context for SMT based MaxSMT solver (wmax requires SMT core)
         virtual unsigned num_objectives() = 0;
         virtual bool verify_model(unsigned id, model* mdl, rational const& v) = 0;
+        virtual rational adjust(unsigned id, rational const& v) = 0;
+        virtual void add_offset(unsigned id, rational const& o) = 0;
         virtual void set_model(model_ref& _m) = 0;
         virtual void model_updated(model* mdl) = 0;
     };
@@ -93,7 +95,7 @@ namespace opt {
             app_ref     m_term;          // for maximize, minimize term
             expr_ref_vector   m_terms;   // for maxsmt
             vector<rational>  m_weights; // for maxsmt
-            adjust_value  m_adjust_value;
+            adjust_value      m_adjust_value;
             symbol      m_id;            // for maxsmt
             unsigned    m_index;         // for maximize/minimize index
 
@@ -269,11 +271,14 @@ namespace opt {
         
         void model_updated(model* mdl) override;
 
+        rational adjust(unsigned id, rational const& v) override;
+
+        void add_offset(unsigned id, rational const& o) override;
+
         void register_on_model(on_model_t& ctx, std::function<void(on_model_t&, model_ref&)>& on_model) { 
             m_on_model_ctx = ctx; 
             m_on_model_eh  = on_model; 
         }
-
       
         void collect_timer_stats(statistics& st) const {
 	  if (m_time != 0) 
diff --git a/src/opt/opt_solver.h b/src/opt/opt_solver.h
index caac008fd..47fe86f94 100644
--- a/src/opt/opt_solver.h
+++ b/src/opt/opt_solver.h
@@ -48,6 +48,7 @@ namespace opt {
         void set_offset(rational const& o) { m_offset = o; }
         void set_negate(bool neg) { m_negate = neg; }
         rational const& get_offset() const { return m_offset; }
+        void add_offset(rational const& o) { if (m_negate) m_offset -= o; else m_offset += o; }
         bool get_negate() { return m_negate; }
         inf_eps operator()(inf_eps const& r) const {
             inf_eps result = r;
diff --git a/src/opt/sortmax.cpp b/src/opt/sortmax.cpp
index a6539e129..962369bf2 100644
--- a/src/opt/sortmax.cpp
+++ b/src/opt/sortmax.cpp
@@ -36,8 +36,8 @@ namespace opt {
         expr_ref_vector   m_trail;
         func_decl_ref_vector m_fresh;
         ref<generic_model_converter> m_filter;
-        sortmax(maxsat_context& c, vector<soft>& s): 
-            maxsmt_solver_base(c, s), m_sort(*this), m_trail(m), m_fresh(m) {}
+        sortmax(maxsat_context& c, vector<soft>& s, unsigned index): 
+            maxsmt_solver_base(c, s, index), m_sort(*this), m_trail(m), m_fresh(m) {}
 
         ~sortmax() override {}
 
@@ -138,8 +138,8 @@ namespace opt {
     };
     
     
-    maxsmt_solver_base* mk_sortmax(maxsat_context& c, vector<soft>& s) {
-        return alloc(sortmax, c, s);
+    maxsmt_solver_base* mk_sortmax(maxsat_context& c, vector<soft>& s, unsigned index) {
+        return alloc(sortmax, c, s, index);
     }
 
 }
diff --git a/src/opt/wmax.cpp b/src/opt/wmax.cpp
index 812c8f954..1fbd26cb8 100644
--- a/src/opt/wmax.cpp
+++ b/src/opt/wmax.cpp
@@ -44,8 +44,8 @@ namespace opt {
         }
 
     public:
-        wmax(maxsat_context& c, vector<soft>& s): 
-            maxsmt_solver_base(c, s),
+        wmax(maxsat_context& c, vector<soft>& s, unsigned index): 
+            maxsmt_solver_base(c, s, index),
             m_trail(m),
             m_defs(m) {}
 
@@ -304,8 +304,8 @@ namespace opt {
                 
     };
 
-    maxsmt_solver_base* mk_wmax(maxsat_context& c, vector<soft> & s) {
-        return alloc(wmax, c, s);
+    maxsmt_solver_base* mk_wmax(maxsat_context& c, vector<soft> & s, unsigned index) {
+        return alloc(wmax, c, s, index);
     }
 
 }
diff --git a/src/opt/wmax.h b/src/opt/wmax.h
index 0a5167269..7f5b26ac6 100644
--- a/src/opt/wmax.h
+++ b/src/opt/wmax.h
@@ -22,8 +22,8 @@ Notes:
 #include "opt/maxsmt.h"
 
 namespace opt {
-    maxsmt_solver_base* mk_wmax(maxsat_context& c, vector<soft>& s);
+    maxsmt_solver_base* mk_wmax(maxsat_context& c, vector<soft>& s, unsigned index);
 
-    maxsmt_solver_base* mk_sortmax(maxsat_context& c, vector<soft>& s);
+    maxsmt_solver_base* mk_sortmax(maxsat_context& c, vector<soft>& s, unsigned index);
 
 }