diff --git a/src/proto/window.pro b/src/proto/window.pro
index 70d6b06..5316f95 100644
--- a/src/proto/window.pro
+++ b/src/proto/window.pro
@@ -1,5 +1,5 @@
 /* window.c */
-int window_layout_locked(void);
+int window_layout_locked(enum CMD_index cmd);
 win_T *prevwin_curwin(void);
 void do_window(int nchar, long Prenum, int xchar);
 void get_wincmd_addr_type(char_u *arg, exarg_T *eap);