diff --git a/src/structs.h b/src/structs.h
index fb27745..f6db264 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -2890,6 +2890,8 @@
     int		w_wantcol;	    // "col" for popup window
     int		w_popup_padding[4]; // popup padding top/right/bot/left
     int		w_popup_border[4];  // popup border top/right/bot/left
+    char_u	*w_border_highlight[4];  // popup border highlight
+    int		w_border_char[8];   // popup border characters
     varnumber_T	w_popup_last_changedtick; // b:changedtick when position was
 					  // computed
     callback_T	w_filter_cb;	    // popup filter callback