diff --git a/assets/sass/layout/_header.scss b/assets/sass/layout/_header.scss
index aca5a4a78bb..7dfcf047e49 100644
--- a/assets/sass/layout/_header.scss
+++ b/assets/sass/layout/_header.scss
@@ -42,7 +42,7 @@
 			margin: 0 0 (_size(element-margin) * 0.25) 0;
 			text-decoration: none;
 			display: inline-block;
-			font-size: 1.4em;
+			font-size: 1.4rem;
 
 			.symbol {
 				margin-right: 0.65em;