diff --git a/src/sass/bourbon/functions/_deprecated-webkit-gradient.scss b/src/sass/bourbon/functions/_deprecated-webkit-gradient.scss
index 9126929525..491c1bced6 100644
--- a/src/sass/bourbon/functions/_deprecated-webkit-gradient.scss
+++ b/src/sass/bourbon/functions/_deprecated-webkit-gradient.scss
@@ -20,7 +20,7 @@
 
     @else if $gradient != null {
       @if $i == $full-length {
-        $percentage: 100%;
+        $percentage: "100%";
       }
 
       @else {