diff --git a/mindplot/src/main/javascript/DragTopic.js b/mindplot/src/main/javascript/DragTopic.js
index dadae382..051fff42 100644
--- a/mindplot/src/main/javascript/DragTopic.js
+++ b/mindplot/src/main/javascript/DragTopic.js
@@ -135,7 +135,7 @@ mindplot.DragTopic = new Class({
         if (isDragConnected) {
 
             var targetTopic = this.getConnectedToTopic();
-            if (targetTopic.getType() == mindplot.NodeModel.CENTRAL_TOPIC_TYPE) {
+            if (targetTopic.getType() == mindplot.model.NodeModel.CENTRAL_TOPIC_TYPE) {
                 // Update topic position ...
                 var dragPivotPosition = dragPivot.getPosition();
 
diff --git a/mindplot/src/main/javascript/header.js b/mindplot/src/main/javascript/header.js
index 28cb8e70..61884d9d 100644
--- a/mindplot/src/main/javascript/header.js
+++ b/mindplot/src/main/javascript/header.js
@@ -26,4 +26,5 @@ var mindplot = {};
 mindplot.util = {};
 mindplot.commands = {};
 mindplot.layout = {};
-mindplot.widget = {};
\ No newline at end of file
+mindplot.widget = {};
+mindplot.model = {};
diff --git a/mindplot/src/main/javascript/model/Mindmap.js b/mindplot/src/main/javascript/model/Mindmap.js
index bfc205dc..1db480ce 100644
--- a/mindplot/src/main/javascript/model/Mindmap.js
+++ b/mindplot/src/main/javascript/model/Mindmap.js
@@ -15,7 +15,6 @@
  *   See the License for the specific language governing permissions and
  *   limitations under the License.
  */
-mindplot.model = {};
 mindplot.model.Mindmap = new Class({
         initialize : function() {
             this._branches = [];