diff --git a/wadsrc/static/zscript/engine/ui/menu/optionmenuitems.zs b/wadsrc/static/zscript/engine/ui/menu/optionmenuitems.zs
index bde6114d1..7ece14176 100644
--- a/wadsrc/static/zscript/engine/ui/menu/optionmenuitems.zs
+++ b/wadsrc/static/zscript/engine/ui/menu/optionmenuitems.zs
@@ -722,7 +722,7 @@ class OptionMenuSliderBase : OptionMenuItem
 	{
 	}
 
-	bool IsGrayed(void)
+	virtual bool IsGrayed(void)
 	{
 		return mGrayCheck != NULL && !mGrayCheck.GetInt();
 	}