diff --git a/sc2/src/sc2code/libs/strlib.h b/sc2/src/sc2code/libs/strlib.h
index 1086d02e6..69d80d163 100644
--- a/sc2/src/sc2code/libs/strlib.h
+++ b/sc2/src/sc2code/libs/strlib.h
@@ -23,6 +23,8 @@
 #include "port.h"
 #include "libs/uio.h"
 
+#include <stddef.h>
+
 typedef DWORD STRING_TABLE;
 typedef DWORD STRING;
 typedef PBYTE STRINGPTR;