diff --git a/angular-ui-bootstrap/angular-ui-bootstrap-tests.ts b/angular-ui-bootstrap/angular-ui-bootstrap-tests.ts
index c9883f86e..5aef97afa 100644
--- a/angular-ui-bootstrap/angular-ui-bootstrap-tests.ts
+++ b/angular-ui-bootstrap/angular-ui-bootstrap-tests.ts
@@ -141,6 +141,7 @@ testApp.controller('TestCtrl', (
         scope: $scope,
         template: "<div>i'm a template!</div>",
         templateUrl: '/templates/modal.html',
+        backdropClass: 'modal-backdrop-test',
         windowClass: 'modal-test'
     });
 
@@ -227,4 +228,4 @@ interface IModalTestCtrlScope {
 
     close(): void;
     dismiss(): void;
-}
\ No newline at end of file
+}
diff --git a/angular-ui-bootstrap/angular-ui-bootstrap.d.ts b/angular-ui-bootstrap/angular-ui-bootstrap.d.ts
index c3675e7a9..f6273dbd3 100644
--- a/angular-ui-bootstrap/angular-ui-bootstrap.d.ts
+++ b/angular-ui-bootstrap/angular-ui-bootstrap.d.ts
@@ -264,6 +264,11 @@ declare module angular.ui.bootstrap {
          */
         keyboard?: boolean;
 
+        /**
+         * additional CSS class(es) to be added to a modal backdrop template
+         */
+        backdropClass?: string;
+
         /**
          * additional CSS class(es) to be added to a modal window template
          */