diff --git a/plugins/org.eclipse.bpmn2.modeler.ui/src/org/eclipse/bpmn2/modeler/ui/editor/BPMN2Editor.java b/plugins/org.eclipse.bpmn2.modeler.ui/src/org/eclipse/bpmn2/modeler/ui/editor/BPMN2Editor.java
index 911506f..f903cf6 100644
--- a/plugins/org.eclipse.bpmn2.modeler.ui/src/org/eclipse/bpmn2/modeler/ui/editor/BPMN2Editor.java
+++ b/plugins/org.eclipse.bpmn2.modeler.ui/src/org/eclipse/bpmn2/modeler/ui/editor/BPMN2Editor.java
@@ -388,8 +388,10 @@
 				// If the bpmn file was missing DI elements, they would have been added by the importer
 				// so save the file now in case it was changed.
 				saveModelFile();
+			} else {
+				modelHandler.getDefinitions().setTargetNamespace(targetNamespace);
 			}
-			
+
 			DIImport di = new DIImport(this);
 			di.setModelHandler(modelHandler);