diff --git a/src/ast/ast.cpp b/src/ast/ast.cpp
index 93769a3b4..050ada521 100644
--- a/src/ast/ast.cpp
+++ b/src/ast/ast.cpp
@@ -1865,8 +1865,8 @@ void ast_manager::delete_node(ast * n) {
             dec_array_ref(worklist, to_quantifier(n)->get_num_patterns(), to_quantifier(n)->get_patterns());
             dec_array_ref(worklist, to_quantifier(n)->get_num_no_patterns(), to_quantifier(n)->get_no_patterns());
             break;
-    default:
-        break;
+        default:
+            break;
         }
         if (m_debug_ref_count) {
             m_debug_free_indices.insert(n->m_id,0);
diff --git a/src/smt/smt_consequences.cpp b/src/smt/smt_consequences.cpp
index 1ae9f28e7..922156d46 100644
--- a/src/smt/smt_consequences.cpp
+++ b/src/smt/smt_consequences.cpp
@@ -234,7 +234,6 @@ namespace smt {
             expr* e = it->m_key;
             expr* val = it->m_value;
             push_scope();
-            unsigned current_level = m_scope_lvl;
 
             literal lit;
             if (m.is_bool(e)) {
diff --git a/src/smt/smt_internalizer.cpp b/src/smt/smt_internalizer.cpp
index a17271e4e..d4880f7d7 100644
--- a/src/smt/smt_internalizer.cpp
+++ b/src/smt/smt_internalizer.cpp
@@ -1284,7 +1284,6 @@ namespace smt {
         TRACE("mk_clause", tout << "creating clause:\n"; display_literals(tout, num_lits, lits); tout << "\n";);
         switch (k) {
         case CLS_AUX: {
-            unsigned old_num_lits = num_lits;
             literal_buffer simp_lits;
             if (!simplify_aux_clause_literals(num_lits, lits, simp_lits))
                 return 0; // clause is equivalent to true;