diff --git a/stateful/base.py b/stateful/base.py
index c617282..dffd116 100644
--- a/stateful/base.py
+++ b/stateful/base.py
@@ -26,7 +26,10 @@ from persistent.interfaces import IPersistent
 from persistent.mapping import PersistentMapping
 from zope import component
 from zope.component import adapts
-from zope.component.interfaces import ObjectEvent
+try:
+    from zope.component.interfaces import ObjectEvent
+except ImportError: # Zope 2.9
+    from zope.app.event.objectevent import ObjectEvent
 from zope.event import notify
 from zope.interface import implements
 
diff --git a/stateful/interfaces.py b/stateful/interfaces.py
index 4a765c1..cf834d9 100644
--- a/stateful/interfaces.py
+++ b/stateful/interfaces.py
@@ -22,7 +22,10 @@ Interfaces for the `stateful` package.
 $Id$
 """
 
-from zope.component.interfaces import IObjectEvent
+try:
+    from zope.component.interfaces import IObjectEvent
+except ImportError: # Zope 2.9
+    from zope.app.event.interfaces import IObjectEvent
 from zope.interface import Interface, Attribute