diff --git a/scss/_functions.scss b/scss/_functions.scss
index 3c7258ee87a6..695e6cd2f8d7 100644
--- a/scss/_functions.scss
+++ b/scss/_functions.scss
@@ -130,5 +130,5 @@
     @return $value1 - $value2;
   }
 
-  @return if($return-calc == true, calc(#{$value1} - #{$value2}), #{$value1} - #{$value2});
+  @return if($return-calc == true, calc(#{$value1} - #{$value2}), $value1 + unquote(" - ") + $value2);
 }