diff --git a/res/css/views/elements/_RichText.scss b/res/css/views/elements/_RichText.scss
index 21d01fdd51..d46d07e82b 100644
--- a/res/css/views/elements/_RichText.scss
+++ b/res/css/views/elements/_RichText.scss
@@ -13,7 +13,7 @@
     height: $font-16px;
     line-height: $font-20px;
     padding-left: 0;
-    padding-right: 0.5em;
+    padding-right: 0.5rem;
 }
 
 a.mx_Pill {