diff --git a/reactos/tools/widl/parser.tab.c b/reactos/tools/widl/parser.tab.c
index cdb7eeb41a1..2dcd1ef2291 100644
--- a/reactos/tools/widl/parser.tab.c
+++ b/reactos/tools/widl/parser.tab.c
@@ -6510,6 +6510,7 @@ static void check_field_common(const type_t *container_type,
     default:
         /* should be no other container types */
         assert(0);
+        return;
     }
 
     if (is_attr(arg->attrs, ATTR_LENGTHIS) &&
diff --git a/reactos/tools/widl/parser.y b/reactos/tools/widl/parser.y
index 2af7742d172..71b7ed69142 100644
--- a/reactos/tools/widl/parser.y
+++ b/reactos/tools/widl/parser.y
@@ -2348,6 +2348,7 @@ static void check_field_common(const type_t *container_type,
     default:
         /* should be no other container types */
         assert(0);
+        return;
     }
 
     if (is_attr(arg->attrs, ATTR_LENGTHIS) &&