diff --git a/polymer-flex-layout.css b/polymer-flex-layout.css
index 7558546..16e989f 100644
--- a/polymer-flex-layout.css
+++ b/polymer-flex-layout.css
@@ -35,9 +35,9 @@ license that can be found in the LICENSE file.
   flex: 1;
 }
 
-::-webkit-distributed(.flex), 
-::-webkit-distributed([flex]),
-::-webkit-distributed([fit]) {
+::content(.flex), 
+::content([flex]),
+::content([fit]) {
   -webkit-box-flex: 1;
   -ms-flex: 1;
   -moz-flex: 1;