diff --git a/src/proto/popupwin.pro b/src/proto/popupwin.pro
index 7608f32..96b21b6 100644
--- a/src/proto/popupwin.pro
+++ b/src/proto/popupwin.pro
@@ -33,6 +33,7 @@
 void popup_show(win_T *wp);
 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);
 void close_all_popups(void);
@@ -41,7 +42,6 @@
 void f_popup_getpos(typval_T *argvars, typval_T *rettv);
 void f_popup_locate(typval_T *argvars, typval_T *rettv);
 void f_popup_getoptions(typval_T *argvars, typval_T *rettv);
-int error_if_popup_window(int also_with_term);
 int error_if_term_popup_window(void);
 void popup_reset_handled(int handled_flag);
 win_T *find_next_popup(int lowest, int handled_flag);