diff --git a/src/proto/eval.pro b/src/proto/eval.pro
index 0e6182f..f501300 100644
--- a/src/proto/eval.pro
+++ b/src/proto/eval.pro
@@ -116,7 +116,7 @@
 void ex_execute(exarg_T *eap);
 win_T *find_win_by_nr(typval_T *vp, tabpage_T *tp);
 win_T *find_win_by_nr_or_id(typval_T *vp);
-win_T *find_tabwin(typval_T *wvp, typval_T *tvp);
+win_T *find_tabwin(typval_T *wvp, typval_T *tvp, tabpage_T **ptp);
 void getwinvar(typval_T *argvars, typval_T *rettv, int off);
 void setwinvar(typval_T *argvars, typval_T *rettv, int off);
 char_u *autoload_name(char_u *name);