diff --git a/src/opt/opt_context.cpp b/src/opt/opt_context.cpp
index da2926429..05dc63efa 100644
--- a/src/opt/opt_context.cpp
+++ b/src/opt/opt_context.cpp
@@ -810,7 +810,7 @@ namespace opt {
                      mk_simplify_tactic(m));   
         opt_params optp(m_params);
         tactic_ref tac1, tac2, tac3, tac4;
-        if (optp.elim_01()) {
+        if (optp.elim_01() && m_logic.is_null()) {
             tac1 = mk_dt2bv_tactic(m);
             tac2 = mk_lia2card_tactic(m);
             tac3 = mk_eq2bv_tactic(m);