diff --git a/lib/directive/ng_class.dart b/lib/directive/ng_class.dart
index 7972a465f..b3de27c92 100644
--- a/lib/directive/ng_class.dart
+++ b/lib/directive/ng_class.dart
@@ -47,7 +47,8 @@ part of angular.directive;
  */
 @NgDirective(
     selector: '[ng-class]',
-    map: const {'ng-class': '@valueExpression'})
+    map: const {'ng-class': '@valueExpression'},
+    exportExpressionAttrs: const ['ng-class'])
 class NgClassDirective extends _NgClassBase {
   NgClassDirective(dom.Element element, Scope scope, NodeAttrs attrs)
       : super(element, scope, null, attrs);
@@ -81,7 +82,8 @@ class NgClassDirective extends _NgClassBase {
  */
 @NgDirective(
     selector: '[ng-class-odd]',
-    map: const {'ng-class-odd': '@valueExpression'})
+    map: const {'ng-class-odd': '@valueExpression'},
+    exportExpressionAttrs: const ['ng-class-odd'])
 class NgClassOddDirective extends _NgClassBase {
   NgClassOddDirective(dom.Element element, Scope scope, NodeAttrs attrs)
       : super(element, scope, 0, attrs);
@@ -115,7 +117,8 @@ class NgClassOddDirective extends _NgClassBase {
  */
 @NgDirective(
     selector: '[ng-class-even]',
-    map: const {'ng-class-even': '@valueExpression'})
+    map: const {'ng-class-even': '@valueExpression'},
+    exportExpressionAttrs: const ['ng-class-even'])
 class NgClassEvenDirective extends _NgClassBase {
   NgClassEvenDirective(dom.Element element, Scope scope, NodeAttrs attrs)
       : super(element, scope, 1, attrs);