diff --git a/Mac/Include/macglue.h b/Mac/Include/macglue.h
index fe8d691..a3bfb90 100644
--- a/Mac/Include/macglue.h
+++ b/Mac/Include/macglue.h
@@ -93,7 +93,7 @@
 PyObject * PyMac_LoadResourceModule(char *, char *); /* Load 'PYC ' resource from file */
 int PyMac_FindCodeResourceModule(PyStringObject *, char *, char *); /* Test for 'PYD ' resource in a file */
 PyObject * PyMac_LoadCodeResourceModule(char *, char *); /* Load 'PYD ' resource from file */
-struct filedescr *PyMac_FindModuleExtension(char *, int *, char *); /* Look for module in single folder */
+struct filedescr *PyMac_FindModuleExtension(char *, size_t *, char *); /* Look for module in single folder */
 
 int PyMac_GetDirectory(FSSpec *dirfss, char *prompt);		/* Ask user for a directory */
 void PyMac_PromptGetFile(short numTypes, ConstSFTypeListPtr typeList, 
diff --git a/Mac/Python/macimport.c b/Mac/Python/macimport.c
index 2f5d622..1b3b994 100644
--- a/Mac/Python/macimport.c
+++ b/Mac/Python/macimport.c
@@ -407,7 +407,7 @@
 ** pathname of the module found (if any).
 */
 struct filedescr *
-PyMac_FindModuleExtension(char *buf, int *lenp, char *module)
+PyMac_FindModuleExtension(char *buf, size_t *lenp, char *module)
 {
 	struct filedescr *fdp;
 	unsigned char fnbuf[64];