diff --git a/tests/test-remotefilelog-datapack.py b/tests/test-remotefilelog-datapack.py
--- a/tests/test-remotefilelog-datapack.py
+++ b/tests/test-remotefilelog-datapack.py
@@ -38,6 +38,7 @@
 class datapacktestsbase(object):
     def __init__(self, datapackreader, paramsavailable):
         self.datapackreader = datapackreader
+        self.iscdatapack = not paramsavailable
         self.paramsavailable = paramsavailable
 
     def setUp(self):
@@ -302,7 +303,7 @@
             # Ensures that we are not keeping everything in the cache.
             DEFAULTCACHESIZE = numpacks / 2
 
-        store = testdatapackstore(mercurial.ui.ui(), packdir)
+        store = testdatapackstore(mercurial.ui.ui(), packdir, self.iscdatapack)
 
         random.shuffle(deltachains)
         for randomchain in deltachains: