diff --git a/vendor/assets/stylesheets/old-bootstrap.scss b/vendor/assets/stylesheets/old-bootstrap.scss
index 2a171d492..4f1406046 100644
--- a/vendor/assets/stylesheets/old-bootstrap.scss
+++ b/vendor/assets/stylesheets/old-bootstrap.scss
@@ -822,7 +822,7 @@ a.badge:hover {
   margin-top: 1px;
   line-height: 14px;
   vertical-align: text-top;
-  background-image: url("glyphicons-halflings.png");
+  background-image: image-url("glyphicons-halflings.png");
   background-position: 14px 14px;
   background-repeat: no-repeat;
 }