diff --git a/src/ralph/dc_view/static/js/app/data_center/controllers.js b/src/ralph/dc_view/static/js/app/data_center/controllers.js
index dad13e66bc..86a6b7fb9d 100644
--- a/src/ralph/dc_view/static/js/app/data_center/controllers.js
+++ b/src/ralph/dc_view/static/js/app/data_center/controllers.js
@@ -23,8 +23,8 @@
                 rack.visualization_col = x;
                 rack.visualization_row = y;
                 rack.orientation = 'top';
+                rack.server_room = '';
                 rack.name = 'New rack';
-                rack.data_center = data_center.id;
                 rack.new = true;
                 data_center.rack_set.push(rack);
                 $scope.$emit('edit_rack', rack);
@@ -45,6 +45,7 @@
                 var rack_model = new RackModel(rack);
                 var rack_promise = null;
                 var success_msg = '';
+
                 if (typeof(rack.id) !== 'undefined') {
                     rack_promise = rack_model.$update();
                     success_msg = 'updated';
@@ -73,6 +74,7 @@
                     rack.active = false;
                 });
                 rack.active = true;
+                rack.server_room = rack.server_room && rack.server_room.toString();
                 $scope.rack = rack;
                 $scope.forms.edit_form.action = 'edit';
                 $scope.forms.edit_form.$error = {};
diff --git a/src/ralph/dc_view/static/partials/data_center/data_center.html b/src/ralph/dc_view/static/partials/data_center/data_center.html
index b0d7348b31..11a0dd8bab 100644
--- a/src/ralph/dc_view/static/partials/data_center/data_center.html
+++ b/src/ralph/dc_view/static/partials/data_center/data_center.html
@@ -34,7 +34,7 @@
         </div>
         <div ng-show="rack">
             <form name="forms.edit_form" class="form" ng-submit="addOrEdit(rack)">
-                <div data-alert class="alert-box error" ng-show="forms.edit_form.$error.all" ng-repeat="error in forms.edit_form.$error.all">
+                <div data-alert class="alert-box alert" ng-show="forms.edit_form.$error.all" ng-repeat="error in forms.edit_form.$error.all">
                     {{ error }}
                 </div>
                 <div class="row">
@@ -46,13 +46,15 @@
                   </div>
                 </div>
                 <div class="row">
-                  <div class="large-12 columns">
+                  <div class="large-12 columns" ng-class="{'error': forms.edit_form.server_room.$invalid}">
                       <label for="id_name">Server room
-                        <select name="server_room" ng-model="rack.server_room"  required>
+                        <select name="server_room" ng-model="rack.server_room" required>
+                          <option value="">----</option>
                           <option value="{{ room.id }}" ng-repeat="room in data_center.server_rooms">
                             {{ room.name }}
                           </option>
                         </select>
+                        <span class="help-inline" ng-show="forms.edit_form.server_room.$error.required">Select server room.</span>
                       </label>
                   </div>
                 </div>