diff --git a/src/tactic/arith/bv2int_rewriter.cpp b/src/tactic/arith/bv2int_rewriter.cpp
index c4c13e316..e0cb05cfa 100644
--- a/src/tactic/arith/bv2int_rewriter.cpp
+++ b/src/tactic/arith/bv2int_rewriter.cpp
@@ -17,12 +17,13 @@ Notes:
 
 --*/
 #include "tactic/arith/bv2int_rewriter.h"
+#include "tactic/tactic_exception.h"
 #include "ast/rewriter/rewriter_def.h"
 #include "ast/ast_pp.h"
 #include "ast/ast_util.h"
 
 void bv2int_rewriter_ctx::update_params(params_ref const& p) {
-    m_max_size = p.get_uint("max_bv_size", UINT_MAX);
+    m_max_size = p.get_uint("max_bv_size", m_max_size);
 }
 
 struct lt_rational {
@@ -617,6 +618,9 @@ expr* bv2int_rewriter::mk_extend(unsigned sz, expr* b, bool is_signed) {
     if (sz == 0) {
         return b;
     }
+	if (sz > m_ctx.get_max_num_bits()) {
+		throw tactic_exception(TACTIC_MAX_MEMORY_MSG);
+	}
     rational r;
     unsigned bv_sz;
     if (is_signed) {
diff --git a/src/tactic/arith/bv2int_rewriter.h b/src/tactic/arith/bv2int_rewriter.h
index 89a572d12..698328459 100644
--- a/src/tactic/arith/bv2int_rewriter.h
+++ b/src/tactic/arith/bv2int_rewriter.h
@@ -33,8 +33,10 @@ class bv2int_rewriter_ctx {
     expr_ref_vector          m_trail;
     
 public:
-    bv2int_rewriter_ctx(ast_manager& m, params_ref const& p) : 
-        m_max_size(UINT_MAX), m_side_conditions(m), m_trail(m) { update_params(p); }
+    bv2int_rewriter_ctx(ast_manager& m, params_ref const& p, unsigned max_size) : 
+		m_max_size(max_size), m_side_conditions(m), m_trail(m) {
+		update_params(p); 
+	}
 
     void reset() { m_side_conditions.reset(); m_trail.reset(); m_power2.reset(); }
     void add_side_condition(expr* e) { m_side_conditions.push_back(e); }
diff --git a/src/tactic/arith/nla2bv_tactic.cpp b/src/tactic/arith/nla2bv_tactic.cpp
index 6662aec33..d11da3274 100644
--- a/src/tactic/arith/nla2bv_tactic.cpp
+++ b/src/tactic/arith/nla2bv_tactic.cpp
@@ -69,7 +69,7 @@ class nla2bv_tactic : public tactic {
             m_arith(m), 
             m_bv(m), 
             m_bv2real(m, rational(p.get_uint("nla2bv_root",2)), rational(p.get_uint("nla2bv_divisor",2)), p.get_uint("nla2bv_max_bv_size", UINT_MAX)),
-            m_bv2int_ctx(m, p),
+            m_bv2int_ctx(m, p, p.get_uint("nla2bv_max_bv_size", UINT_MAX)),
             m_bounds(m), 
             m_subst(m), 
             m_vars(m), 
@@ -80,6 +80,9 @@ class nla2bv_tactic : public tactic {
         }
 
         ~imp() {}
+
+		void updt_params(params_ref const& p)  {
+		}
         
         
         void operator()(goal & g, model_converter_ref & mc) {
@@ -440,7 +443,7 @@ public:
     }
 
     void updt_params(params_ref const & p) override {
-        m_params = p;
+		m_params.append(p);
     }
 
     void collect_param_descrs(param_descrs & r) override {
diff --git a/src/tactic/fd_solver/bounded_int2bv_solver.cpp b/src/tactic/fd_solver/bounded_int2bv_solver.cpp
index bfeb48d8b..39d1f02b3 100644
--- a/src/tactic/fd_solver/bounded_int2bv_solver.cpp
+++ b/src/tactic/fd_solver/bounded_int2bv_solver.cpp
@@ -56,7 +56,7 @@ public:
         m_solver(s),
         m_bv_fns(m),
         m_int_fns(m),
-        m_rewriter_ctx(m, p),
+        m_rewriter_ctx(m, p, p.get_uint("max_bv_size", UINT_MAX)),
         m_rewriter(m, m_rewriter_ctx)
     {
         solver::updt_params(p);
diff --git a/src/tactic/smtlogics/qfnia_tactic.cpp b/src/tactic/smtlogics/qfnia_tactic.cpp
index ec22c7c19..2872d9454 100644
--- a/src/tactic/smtlogics/qfnia_tactic.cpp
+++ b/src/tactic/smtlogics/qfnia_tactic.cpp
@@ -87,7 +87,7 @@ static tactic * mk_qfnia_sat_solver(ast_manager & m, params_ref const & p) {
 
     return and_then(using_params(mk_simplify_tactic(m), simp_p),
                     mk_nla2bv_tactic(m, nia2sat_p),
-                    mk_qfnia_bv_solver(m, p),
+                    skip_if_failed(mk_qfnia_bv_solver(m, p)),
                     mk_fail_if_undecided_tactic());
 }