diff --git a/databroker/tests/test_broker.py b/databroker/tests/test_broker.py
index 0be79b79d..5eb6def75 100644
--- a/databroker/tests/test_broker.py
+++ b/databroker/tests/test_broker.py
@@ -239,7 +239,6 @@ def test_indexing(db_empty, RE, hw):
         db[-11]
 
 
-@pytest.mark.xfail(reason="Databroker catalog expects int not int64")
 def test_int64_indexing(db_empty, RE, hw):
     db = db_empty
     RE.subscribe(db.insert)
@@ -259,6 +258,12 @@ def test_int64_indexing(db_empty, RE, hw):
     with does_not_raise():
         db[integer64_index]
 
+    integer64_index = np.int64(2**33)
+    assert not isinstance(integer64_index, int)
+    assert isinstance(integer64_index, numbers.Integral)
+    with pytest.raises(KeyError):
+        db[integer64_index]
+
 
 def test_full_text_search(db_empty, RE, hw):
     db = db_empty