diff --git a/Mac/Modules/res/Resmodule.c b/Mac/Modules/res/Resmodule.c
index dd5d75ac5ad..e903158cf12 100644
--- a/Mac/Modules/res/Resmodule.c
+++ b/Mac/Modules/res/Resmodule.c
@@ -43,6 +43,7 @@ extern int BMObj_Convert(PyObject *, BitMapPtr *);
 extern PyObject *WinObj_WhichWindow(WindowPtr);
 
 #include <Resources.h>
+#include <string.h>
 
 #define resNotFound -192 /* Can't include <Errors.h> because of Python's "errors.h" */
 
diff --git a/Mac/Modules/res/ressupport.py b/Mac/Modules/res/ressupport.py
index 8c899f04102..4b4bd2f90d7 100644
--- a/Mac/Modules/res/ressupport.py
+++ b/Mac/Modules/res/ressupport.py
@@ -25,6 +25,7 @@ class ResMethod(ResMixIn, MethodGenerator): pass
 
 includestuff = includestuff + """
 #include <Resources.h>
+#include <string.h>
 
 #define resNotFound -192 /* Can't include <Errors.h> because of Python's "errors.h" */
 """