diff --git a/sass/mixins/_mixins-master.scss b/sass/mixins/_mixins-master.scss
index ce40dd64..d1f15288 100644
--- a/sass/mixins/_mixins-master.scss
+++ b/sass/mixins/_mixins-master.scss
@@ -1,7 +1,7 @@
 // Rem output with px fallback
 @mixin font-size($sizeValue: 1) {
-	font-size: ($sizeValue * 16) + px;
-	font-size: $sizeValue + rem;
+	font-size: ($sizeValue * 16) * 1px;
+	font-size: $sizeValue * 1rem;
 }
 
 // Center block