diff --git a/less/mixins.less b/less/mixins.less
index 4432cfc2db..66fd041f6f 100644
--- a/less/mixins.less
+++ b/less/mixins.less
@@ -379,7 +379,7 @@
 
   @media
   only screen and (-webkit-min-device-pixel-ratio: 2),
-  only screen and (   min--moz-device-pixel-ratio: 2),
+  only screen and (   min--moz-device-pixel-ratio: 2), // Not a typo
   only screen and (     -o-min-device-pixel-ratio: 2/1),
   only screen and (        min-device-pixel-ratio: 2),
   only screen and (                min-resolution: 192dpi),