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));
diff --git a/src/proto/os_msdos.pro b/src/proto/os_msdos.pro
index a867f3d..e755211 100644
--- a/src/proto/os_msdos.pro
+++ b/src/proto/os_msdos.pro
@@ -38,7 +38,7 @@
 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_can_exe __ARGS((char_u *name));
+int mch_can_exe __ARGS((char_u *name, char_u **path));
 int mch_nodetype __ARGS((char_u *name));
 int mch_dirname __ARGS((char_u *buf, int len));
 int mch_remove __ARGS((char_u *name));
diff --git a/src/proto/os_unix.pro b/src/proto/os_unix.pro
index e4cad51..a59b6aa 100644
--- a/src/proto/os_unix.pro
+++ b/src/proto/os_unix.pro
@@ -42,7 +42,7 @@
 void mch_free_acl __ARGS((vim_acl_T aclent));
 void mch_hide __ARGS((char_u *name));
 int mch_isdir __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_free_mem __ARGS((void));
diff --git a/src/proto/os_win32.pro b/src/proto/os_win32.pro
index a4c590f..c149bc8 100644
--- a/src/proto/os_win32.pro
+++ b/src/proto/os_win32.pro
@@ -26,7 +26,7 @@
 int mch_is_linked __ARGS((char_u *fname));
 int win32_fileinfo __ARGS((char_u *fname, BY_HANDLE_FILE_INFORMATION *info));
 int mch_writable __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));
 vim_acl_T mch_get_acl __ARGS((char_u *fname));
 void mch_set_acl __ARGS((char_u *fname, vim_acl_T acl));