diff --git a/src/tixlbase/tests/test_models.py b/src/tixlbase/tests/test_models.py
index 433510768c..90d5ac4630 100644
--- a/src/tixlbase/tests/test_models.py
+++ b/src/tixlbase/tests/test_models.py
@@ -40,7 +40,6 @@ class ItemVariationsTest(TestCase):
 
         for vd in variations:
             for i, v in vd.relevant_items():
-                self.assertIs(type(i), int)
                 self.assertIs(type(v), PropertyValue)
 
             for v in vd.relevant_values():
diff --git a/src/tixlplugins/timerestriction/signals.py b/src/tixlplugins/timerestriction/signals.py
index 2c75f480e0..4fbcd40304 100644
--- a/src/tixlplugins/timerestriction/signals.py
+++ b/src/tixlplugins/timerestriction/signals.py
@@ -62,8 +62,8 @@ def availability_handler(sender, **kwargs):
         price = None
 
         # Make up some unique key for this variation
-        cachekey = 'timerestriction:%d:%s' % (
-            item.pk,
+        cachekey = 'timerestriction:%s:%s' % (
+            item.identity,
             v.identify(),
         )