diff --git a/src/popupwin.c b/src/popupwin.c
index 99ef290..ea1a1e1 100644
--- a/src/popupwin.c
+++ b/src/popupwin.c
@@ -1336,7 +1336,7 @@
 }
 
     int
-not_in_popup_window()
+error_if_popup_window()
 {
     if (bt_popup(curwin->w_buffer))
     {