diff --git a/src/proto/os_win32.pro b/src/proto/os_win32.pro
index 5816fc9..e6fce88 100644
--- a/src/proto/os_win32.pro
+++ b/src/proto/os_win32.pro
@@ -1,6 +1,6 @@
 /* os_win32.c */
 HINSTANCE vimLoadLib __ARGS((char *name));
-int dyn_libintl_init __ARGS((char *libname));
+int dyn_libintl_init __ARGS((void));
 void dyn_libintl_end __ARGS((void));
 void PlatformId __ARGS((void));
 int mch_windows95 __ARGS((void));