diff --git a/Objects/obmalloc.c b/Objects/obmalloc.c
index fbc9478..88ded83 100644
--- a/Objects/obmalloc.c
+++ b/Objects/obmalloc.c
@@ -1,4 +1,5 @@
 #include "Python.h"
+#include "internal/mem.h"
 
 #include <stdbool.h>