diff --git a/test/test_refs.py b/test/test_refs.py
index ca582c2..ec4b5cc 100644
--- a/test/test_refs.py
+++ b/test/test_refs.py
@@ -67,7 +67,7 @@ class ReferencesTest(utils.RepoTestCase):
         repo = self.repo
 
         # Raise KeyError ?
-        self.assertRaises(KeyError, repo.lookup_reference, 'foo')
+        self.assertRaises(KeyError, repo.lookup_reference, 'refs/foo')
 
         # Test a lookup
         reference = repo.lookup_reference('refs/heads/master')