diff --git a/app/assets/stylesheets/mobile/header.scss b/app/assets/stylesheets/mobile/header.scss
index 67dda8fc3bd..30f480f94b3 100644
--- a/app/assets/stylesheets/mobile/header.scss
+++ b/app/assets/stylesheets/mobile/header.scss
@@ -3,7 +3,7 @@
 // --------------------------------------------------
 
 #site-text-logo {
-  font-size: 1.5em;
+  font-size: $font-up-3;
 }
 @media only screen and (max-width: 320px) {
   #site-text-logo {