diff --git a/ReactCommon/fabric/mounting/ShadowTree.h b/ReactCommon/fabric/mounting/ShadowTree.h
index cc328c4195a..9a87e55d86a 100644
--- a/ReactCommon/fabric/mounting/ShadowTree.h
+++ b/ReactCommon/fabric/mounting/ShadowTree.h
@@ -5,7 +5,7 @@
 
 #pragma once
 
-#ifdef DEBUG
+#ifndef NDEBUG
 #define RN_SHADOW_TREE_INTROSPECTION
 #endif