diff --git a/src/sat/smt/atom2bool_var.cpp b/src/sat/smt/atom2bool_var.cpp
index 65c91ed79..996e8e5e9 100644
--- a/src/sat/smt/atom2bool_var.cpp
+++ b/src/sat/smt/atom2bool_var.cpp
@@ -19,6 +19,7 @@ Notes:
 
 #include "util/ref_util.h"
 #include "ast/ast_smt2_pp.h"
+#include "ast/ast_util.h"
 #include "tactic/goal.h"
 #include "sat/smt/atom2bool_var.h"
 
@@ -27,7 +28,7 @@ void atom2bool_var::mk_inv(expr_ref_vector & lit2expr) const {
         sat::literal l(static_cast<sat::bool_var>(kv.m_value), false);
         lit2expr.set(l.index(), kv.m_key);
         l.neg();
-        lit2expr.set(l.index(), m().mk_not(kv.m_key));
+        lit2expr.set(l.index(), mk_not(m(), kv.m_key));
     }
 }
 
diff --git a/src/sat/tactic/sat2goal.cpp b/src/sat/tactic/sat2goal.cpp
index 482e441ef..7614857cb 100644
--- a/src/sat/tactic/sat2goal.cpp
+++ b/src/sat/tactic/sat2goal.cpp
@@ -218,7 +218,7 @@ struct sat2goal::imp {
             }
             sat::literal lit(l.var(), false);
             m_lit2expr.set(lit.index(), aux);
-            m_lit2expr.set((~lit).index(), m.mk_not(aux));
+            m_lit2expr.set((~lit).index(), mk_not(m, aux));
         }        
         return m_lit2expr.get(l.index());
     }