diff --git a/src/proto/ex_cmds2.pro b/src/proto/ex_cmds2.pro
index 332229f..4914a44 100644
--- a/src/proto/ex_cmds2.pro
+++ b/src/proto/ex_cmds2.pro
@@ -54,7 +54,7 @@
 void ex_compiler __ARGS((exarg_T *eap));
 void ex_runtime __ARGS((exarg_T *eap));
 int cmd_runtime __ARGS((char_u *name, int all));
-int do_in_runtimepath __ARGS((char_u *name, int all, void (*callback)(char_u *fname, void *cookie), void *cookie));
+int do_in_runtimepath __ARGS((char_u *name, int all, void (*callback)(char_u *fname, void *ck), void *cookie));
 void ex_options __ARGS((exarg_T *eap));
 void ex_source __ARGS((exarg_T *eap));
 linenr_T *source_breakpoint __ARGS((void *cookie));