diff --git a/src/proto/os_win32.pro b/src/proto/os_win32.pro
index 185c8ad..179dd5e 100644
--- a/src/proto/os_win32.pro
+++ b/src/proto/os_win32.pro
@@ -19,6 +19,7 @@
 int mch_setperm __ARGS((char_u *name, long perm));
 void mch_hide __ARGS((char_u *name));
 int mch_isdir __ARGS((char_u *name));
+int mch_is_linked __ARGS((char_u *fname));
 int mch_writable __ARGS((char_u *name));
 int mch_can_exe __ARGS((char_u *name));
 int mch_nodetype __ARGS((char_u *name));