diff --git a/Libraries/LibJS/Heap/Heap.cpp b/Libraries/LibJS/Heap/Heap.cpp
index b3853680c4..c75702bd35 100644
--- a/Libraries/LibJS/Heap/Heap.cpp
+++ b/Libraries/LibJS/Heap/Heap.cpp
@@ -40,7 +40,9 @@
 #    include <pthread.h>
 #endif
 
+#ifdef __serenity__
 #define HEAP_DEBUG
+#endif
 
 namespace JS {