diff --git a/guacamole/src/main/webapp/app/index/styles/loading.css b/guacamole/src/main/webapp/app/index/styles/loading.css
index da1d8df9f..0cf0faf60 100644
--- a/guacamole/src/main/webapp/app/index/styles/loading.css
+++ b/guacamole/src/main/webapp/app/index/styles/loading.css
@@ -69,11 +69,11 @@
 }
 
 @-moz-keyframes spinning-cog {
-    0%   { transform: rotate(0deg);   }
-    100% { transform: rotate(360deg); }
+    0%   { -moz-transform: rotate(0deg);   }
+    100% { -moz-transform: rotate(360deg); }
 }
 
 @-webkit-keyframes spinning-cog {
-    0%   { transform: rotate(0deg);   }
-    100% { transform: rotate(360deg); }
+    0%   { -webkit-transform: rotate(0deg);   }
+    100% { -webkit-transform: rotate(360deg); }
 }