diff --git a/data/gui/widget/toggle_button_icon.cfg b/data/gui/widget/toggle_button_icon.cfg
index 15ba02434deb..88eed2dbfc9c 100644
--- a/data/gui/widget/toggle_button_icon.cfg
+++ b/data/gui/widget/toggle_button_icon.cfg
@@ -159,6 +159,15 @@
 
 [/toggle_button_definition]
 
+[toggle_button_definition]
+
+	id = "icon_medium"
+	description = "Medium-sized version of the icon-only toggle button."
+
+	{_GUI_RESOLUTION ({GUI_NORMAL__RESOLUTION}) 25 }
+
+[/toggle_button_definition]
+
 [toggle_button_definition]
 
 	id = "icon_small"