diff --git a/modules/styles/mw.echo.ui.overlay.minerva.less b/modules/styles/mw.echo.ui.overlay.minerva.less
index 93c14f618..7b2d7f901 100644
--- a/modules/styles/mw.echo.ui.overlay.minerva.less
+++ b/modules/styles/mw.echo.ui.overlay.minerva.less
@@ -19,7 +19,7 @@
 
 	.mw-echo-ui-actionMenuPopupWidget-menu {
 		padding: 0.5em;
-		font-size: 16 / 14em;
+		font-size: (16 / 14em);
 		box-shadow: none;
 		border: @border-width-base @border-style-base @border-color-subtle;
 		border-width: @border-width-base 0 0 0;