diff --git a/src/smallmap_gui.cpp b/src/smallmap_gui.cpp
--- a/src/smallmap_gui.cpp
+++ b/src/smallmap_gui.cpp
@@ -1754,6 +1754,7 @@ static const NWidgetPart _nested_smallma
 		NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
 		NWidget(WWT_CAPTION, COLOUR_BROWN, WID_SM_CAPTION), SetDataTip(STR_SMALLMAP_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
 		NWidget(WWT_SHADEBOX, COLOUR_BROWN),
+		NWidget(WWT_DEFSIZEBOX, COLOUR_BROWN),
 		NWidget(WWT_STICKYBOX, COLOUR_BROWN),
 	EndContainer(),
 	NWidgetFunction(SmallMapDisplay), // Smallmap display and legend bar + image buttons.