diff --git a/src/proto/popupwin.pro b/src/proto/popupwin.pro
index 96b21b6..0147e68 100644
--- a/src/proto/popupwin.pro
+++ b/src/proto/popupwin.pro
@@ -34,8 +34,8 @@
 void f_popup_show(typval_T *argvars, typval_T *rettv);
 void f_popup_settext(typval_T *argvars, typval_T *rettv);
 int error_if_popup_window(int also_with_term);
-void popup_close(int id);
-void popup_close_tabpage(tabpage_T *tp, int id);
+int popup_close(int id);
+int popup_close_tabpage(tabpage_T *tp, int id);
 void close_all_popups(void);
 void f_popup_move(typval_T *argvars, typval_T *rettv);
 void f_popup_setoptions(typval_T *argvars, typval_T *rettv);