diff --git a/src/muz_qe/pdr_context.cpp b/src/muz_qe/pdr_context.cpp
index e2b679756..034bb236a 100644
--- a/src/muz_qe/pdr_context.cpp
+++ b/src/muz_qe/pdr_context.cpp
@@ -1562,14 +1562,16 @@ namespace pdr {
             m_fparams.m_arith_auto_config_simplex = true;
             m_fparams.m_arith_propagate_eqs = false;
             m_fparams.m_arith_eager_eq_axioms = false;
-            if (classify.is_dl() && m_params.use_utvpi()) {
-                m_fparams.m_arith_mode = AS_DIFF_LOGIC;
-                m_fparams.m_arith_expand_eqs = true;
-            }
-            else if (classify.is_utvpi() && m_params.use_utvpi()) {
-                IF_VERBOSE(1, verbose_stream() << "UTVPI\n";);
-                m_fparams.m_arith_mode = AS_UTVPI;
-                m_fparams.m_arith_expand_eqs = true;                
+            if (m_params.use_utvpi() && !m_params.use_convex_hull_generalizer()) {
+                if (classify.is_dl()) {
+                    m_fparams.m_arith_mode = AS_DIFF_LOGIC;
+                    m_fparams.m_arith_expand_eqs = true;
+                }
+                else if (classify.is_utvpi()) {
+                    IF_VERBOSE(1, verbose_stream() << "UTVPI\n";);
+                    m_fparams.m_arith_mode = AS_UTVPI;
+                    m_fparams.m_arith_expand_eqs = true;                
+                }
             }
         }
         if (m_params.use_convex_hull_generalizer()) {
diff --git a/src/muz_qe/pdr_generalizers.cpp b/src/muz_qe/pdr_generalizers.cpp
index e73dcdac8..5e928ff45 100644
--- a/src/muz_qe/pdr_generalizers.cpp
+++ b/src/muz_qe/pdr_generalizers.cpp
@@ -158,7 +158,7 @@ namespace pdr {
     }
 
     void core_convex_hull_generalizer::operator()(model_node& n, expr_ref_vector& core, bool& uses_level) {
-        method2(n, core, uses_level);
+        method1(n, core, uses_level);
     }
 
     // use the entire region as starting point for generalization.