diff --git a/less/mixins.less b/less/mixins.less
index 6a24beb03d..901c241962 100644
--- a/less/mixins.less
+++ b/less/mixins.less
@@ -71,7 +71,7 @@
 // CSS image replacement
 // Source: https://github.com/h5bp/html5-boilerplate/commit/aa0396eae757
 .hide-text() {
-  font: 0/0 a;
+  font: ~"0/0" a;
   color: transparent;
   text-shadow: none;
   background-color: transparent;