diff --git a/src/smt/smt_parallel.cpp b/src/smt/smt_parallel.cpp
index 8214b1670..39c3dd607 100644
--- a/src/smt/smt_parallel.cpp
+++ b/src/smt/smt_parallel.cpp
@@ -131,7 +131,7 @@ namespace smt {
                 expr_ref e(ctx->bool_var2expr(v), m);
                 if (!e)
                     continue;
-                if (m.is_or(e) || m.is_ite(e))
+                if (m.is_or(e) || m.is_ite(e) || m.is_and(e) || m.is_iff(e))
                     continue;
                 if (ctx->get_assignment(v) != l_undef && ctx->get_assign_level(v) == ctx->m_base_lvl) {
                     bool is_true = ctx->get_assignment(v) == l_true;
@@ -636,8 +636,8 @@ namespace smt {
                 continue;  // skip non-initial atoms if configured to do so
             }
 
-            expr_ref e(ctx->bool_var2expr(lit.var()), ctx->m);  // turn literal into a Boolean expression
-            if (m.is_and(e) || m.is_or(e))
+            expr_ref e(ctx->bool_var2expr(lit.var()), ctx->m);  // turn literal into a Boolean expression            
+            if (m.is_and(e) || m.is_or(e) || m.is_ite(e) || m.is_iff(e))
                 continue;
 
             if (lit.sign())