diff --git a/resources/skins.vector.styles/components/MenuTabs.less b/resources/skins.vector.styles/components/MenuTabs.less
index 79c5f72c..814893b1 100644
--- a/resources/skins.vector.styles/components/MenuTabs.less
+++ b/resources/skins.vector.styles/components/MenuTabs.less
@@ -56,5 +56,9 @@
 		// NOTE: Was 40px instead of 41, but changed to avoid visual regressions.
 		max-height: unit( 41 / @font-size-tabs / @font-size-browser, em );
 		box-sizing: border-box;
+		// For better compatibility with gadgets (like Twinkle) that append
+		// <H3> elements as dropdown headings (which was the convention in legacy Vector).
+		font-size: inherit;
+		font-weight: normal;
 	}
 }