diff --git a/ir/json_generator.h b/ir/json_generator.h
index 514983f161..2f6e707a07 100644
--- a/ir/json_generator.h
+++ b/ir/json_generator.h
@@ -135,7 +135,10 @@ class JSONGenerator {
                 break;
             case OBJ_END:
                 break;
-            default:
+            case TOP:
+            case VEC_START:
+            case VEC_MID:
+            case OBJ_AFTERTAG:
                 BUG("invalid json output state in end_object");
                 break;
         }