diff --git a/Python/pathconfig.c b/Python/pathconfig.c
index 4e0830f..efccb8d 100644
--- a/Python/pathconfig.c
+++ b/Python/pathconfig.c
@@ -2,6 +2,7 @@
 
 #include "Python.h"
 #include "osdefs.h"
+#include "internal/mem.h"
 #include "internal/pystate.h"
 #include <wchar.h>