diff --git a/eea/facetednavigation/docs/exportimport.txt b/eea/facetednavigation/docs/exportimport.txt
index dfd4aa83..f2372e81 100644
--- a/eea/facetednavigation/docs/exportimport.txt
+++ b/eea/facetednavigation/docs/exportimport.txt
@@ -46,7 +46,7 @@ XML Export
 Export empty criteria
 
     >>> print(exporter.body.decode('utf-8').strip())
-    <?xml version="1.0" encoding="utf-8"?>
+    <?xml...?>
     <object name="sandbox" meta_type="...">
      <criteria/>
     </object>
diff --git a/eea/facetednavigation/events.py b/eea/facetednavigation/events.py
index d91af2af..73a7a672 100644
--- a/eea/facetednavigation/events.py
+++ b/eea/facetednavigation/events.py
@@ -1,7 +1,6 @@
 """ Faceted events
 """
 from zope.interface import implementer
-from zope.interface.interfaces import ObjectEvent
 from eea.facetednavigation.interfaces import (
     IFacetedEvent,
     IFacetedGlobalSettingsChangedEvent,
@@ -12,6 +11,12 @@
     IQueryWillBeExecutedEvent,
 )
 
+try:
+    from zope.interface.interfaces import ObjectEvent
+except ImportError:
+    # very old zope.interface (Plone 4 only)
+    from zope.component.interfaces import ObjectEvent
+
 
 @implementer(IFacetedEvent)
 class FacetedEvent(ObjectEvent):