diff --git a/de.bmotionstudio.gef.editor/src/de/bmotionstudio/gef/editor/action/OpenObserverAction.java b/de.bmotionstudio.gef.editor/src/de/bmotionstudio/gef/editor/action/OpenObserverAction.java
index a64a00439335369603e28acf5ebbad4cca8e82d4..4ed52392ac795a04f75fad7fcda720ef926d3210 100644
--- a/de.bmotionstudio.gef.editor/src/de/bmotionstudio/gef/editor/action/OpenObserverAction.java
+++ b/de.bmotionstudio.gef.editor/src/de/bmotionstudio/gef/editor/action/OpenObserverAction.java
@@ -112,7 +112,8 @@ public class OpenObserverAction extends SelectionAction {
 
 					// Reset observer without using a command!
 					if (oldObserver != null)
-						actionControl.addObserver(oldObserver);
+						actionControl.getObservers().put(oldObserver.getID(),
+								oldObserver);
 
 					// else the user clicked on the delete button in order to
 					// delete the observer