diff --git a/org.eclipse.scout.rt.client/src/main/java/org/eclipse/scout/rt/client/extension/ui/form/fields/IFormFieldExtension.java b/org.eclipse.scout.rt.client/src/main/java/org/eclipse/scout/rt/client/extension/ui/form/fields/IFormFieldExtension.java
index 095c8cb4ae8..e1a7213f872 100644
--- a/org.eclipse.scout.rt.client/src/main/java/org/eclipse/scout/rt/client/extension/ui/form/fields/IFormFieldExtension.java
+++ b/org.eclipse.scout.rt.client/src/main/java/org/eclipse/scout/rt/client/extension/ui/form/fields/IFormFieldExtension.java
@@ -18,11 +18,11 @@
 import org.eclipse.scout.rt.client.extension.ui.form.fields.FormFieldChains.FormFieldIsEmptyChain;
 import org.eclipse.scout.rt.client.extension.ui.form.fields.FormFieldChains.FormFieldIsSaveNeededChain;
 import org.eclipse.scout.rt.client.extension.ui.form.fields.FormFieldChains.FormFieldMarkSavedChain;
-import org.eclipse.scout.rt.client.ui.form.fields.AbstractFormField;
+import org.eclipse.scout.rt.client.ui.form.fields.IFormField;
 import org.eclipse.scout.rt.shared.extension.IExtension;
 import org.eclipse.scout.rt.shared.services.common.jdbc.SearchFilter;
 
-public interface IFormFieldExtension<OWNER extends AbstractFormField> extends IExtension<OWNER> {
+public interface IFormFieldExtension<OWNER extends IFormField> extends IExtension<OWNER> {
 
   void execDataChanged(FormFieldDataChangedChain chain, Object... dataTypes);
 
diff --git a/org.eclipse.scout.rt.client/src/main/java/org/eclipse/scout/rt/client/ui/form/fields/IFormField.java b/org.eclipse.scout.rt.client/src/main/java/org/eclipse/scout/rt/client/ui/form/fields/IFormField.java
index 1d73753c726..5a94723fb82 100644
--- a/org.eclipse.scout.rt.client/src/main/java/org/eclipse/scout/rt/client/ui/form/fields/IFormField.java
+++ b/org.eclipse.scout.rt.client/src/main/java/org/eclipse/scout/rt/client/ui/form/fields/IFormField.java
@@ -31,6 +31,7 @@
 import org.eclipse.scout.rt.shared.data.form.fields.AbstractFormFieldData;
 import org.eclipse.scout.rt.shared.dimension.IDimensions;
 import org.eclipse.scout.rt.shared.dimension.IVisibleDimension;
+import org.eclipse.scout.rt.shared.extension.IExtensibleObject;
 import org.eclipse.scout.rt.shared.services.common.jdbc.SearchFilter;
 import org.w3c.dom.Element;
 
@@ -66,7 +67,7 @@
  *
  * @see IForm
  */
-public interface IFormField extends IWidget, IOrdered, IStyleable, IVisibleDimension, IDataChangeObserver, IContextMenuOwner {
+public interface IFormField extends IWidget, IOrdered, IStyleable, IVisibleDimension, IDataChangeObserver, IContextMenuOwner, IExtensibleObject {
 
   String PROP_VISIBLE = "visible";
   String PROP_MANDATORY = "mandatory";