diff --git a/gtk2_ardour/clearlooks.rc.in b/gtk2_ardour/clearlooks.rc.in
index 9eb5167650..c38f5b30a2 100644
--- a/gtk2_ardour/clearlooks.rc.in
+++ b/gtk2_ardour/clearlooks.rc.in
@@ -1058,6 +1058,8 @@ style "tooltip" = "medium_text"
 	fg[NORMAL] = @fg_tooltip
 	bg[NORMAL] = @bg_tooltip
 	bg[SELECTED] = @bg_tooltip
+	xthickness = 4
+	ythickness = 4
 }
 
 style "default_toggle_button"