diff --git a/src/proto/os_amiga.pro b/src/proto/os_amiga.pro
index 3cbec6d..16ee657 100644
--- a/src/proto/os_amiga.pro
+++ b/src/proto/os_amiga.pro
@@ -26,7 +26,7 @@
 void mch_hide __ARGS((char_u *name));
 int mch_isdir __ARGS((char_u *name));
 int mch_mkdir __ARGS((char_u *name));
-int mch_can_exe __ARGS((char_u *name));
+int mch_can_exe __ARGS((char_u *name, char_u **path));
 int mch_nodetype __ARGS((char_u *name));
 void mch_early_init __ARGS((void));
 void mch_exit __ARGS((int r));