diff --git a/graphics/macgui/macbutton.h b/graphics/macgui/macbutton.h
index 45882137928..1ffeafbd3b6 100644
--- a/graphics/macgui/macbutton.h
+++ b/graphics/macgui/macbutton.h
@@ -30,7 +30,7 @@ namespace Graphics {
 
 class MacWidget;
 class MacText;
-class MacPlotData;
+struct MacPlotData;
 
 enum MacButtonType {
 	kRound,