diff --git a/quickjs.h b/quickjs.h
index 9668abf71..bc37383a9 100644
--- a/quickjs.h
+++ b/quickjs.h
@@ -37,6 +37,8 @@
 extern "C" {
 #endif
 
+#define QUICKJS_NG 1
+
 #if defined(__GNUC__) || defined(__clang__)
 #define js_force_inline       inline __attribute__((always_inline))
 #define JS_EXTERN __attribute__((visibility("default")))