diff --git a/app/views/checkout/_details.html.haml b/app/views/checkout/_details.html.haml
index 8dee9e1cdf..0d071bd319 100644
--- a/app/views/checkout/_details.html.haml
+++ b/app/views/checkout/_details.html.haml
@@ -1,7 +1,7 @@
 %fieldset#details
   %ng-form{"ng-controller" => "DetailsCtrl", name: "details"}
 
-    %h5{"ng-class" => "{valid: details.$valid}"}
+    %h5{"ng-class" => "{valid: details.$valid, dirty: details.$dirty}"}
       %span.right
         %i.fi-x.right
         %i.fi-check.right