diff --git a/swh/objstorage/replayer/tests/test_cli.py b/swh/objstorage/replayer/tests/test_cli.py
--- a/swh/objstorage/replayer/tests/test_cli.py
+++ b/swh/objstorage/replayer/tests/test_cli.py
@@ -20,7 +20,7 @@
 import yaml
 
 from swh.journal.serializers import key_to_kafka
-from swh.model.hashutil import hash_to_hex
+from swh.model.hashutil import MultiHash, hash_to_hex
 from swh.objstorage.backends.in_memory import InMemoryObjStorage
 from swh.objstorage.replayer.cli import objstorage_cli_group
 from swh.objstorage.replayer.replay import CONTENT_REPLAY_RETRIES
@@ -113,7 +113,8 @@
     contents = {}
     for i in range(NUM_CONTENTS):
         content = b"\x00" * 19 + bytes([i])
-        sha1 = objstorage.add(content)
+        sha1 = MultiHash(["sha1"]).from_data(content).digest()["sha1"]
+        objstorage.add(content=content, obj_id=sha1)
         contents[sha1] = content
         producer.produce(
             topic=kafka_prefix + ".content",
diff --git a/swh/objstorage/replayer/tests/test_replay.py b/swh/objstorage/replayer/tests/test_replay.py
--- a/swh/objstorage/replayer/tests/test_replay.py
+++ b/swh/objstorage/replayer/tests/test_replay.py
@@ -50,7 +50,7 @@
     )
 
     for content in CONTENTS:
-        objstorage1.add(content.data)
+        objstorage1.add(content.data, obj_id=content.sha1)
         writer.write_addition("content", content)
 
     replayer = JournalClient(
diff --git a/swh/objstorage/replayer/tests/test_statsd.py b/swh/objstorage/replayer/tests/test_statsd.py
--- a/swh/objstorage/replayer/tests/test_statsd.py
+++ b/swh/objstorage/replayer/tests/test_statsd.py
@@ -49,7 +49,7 @@
     ]
 
     for content in contents:
-        objstorage1.add(content.data)
+        objstorage1.add(content.data, obj_id=content.sha1)
         writer.write_addition("content", content)
     excluded = [c.sha1 for c in contents[2:4]]
 
@@ -57,7 +57,7 @@
         return cnt_d["sha1"] in excluded
 
     for content in contents[4:6]:
-        objstorage2.add(content.data)
+        objstorage2.add(content.data, obj_id=content.sha1)
 
     replayer = JournalClient(
         brokers=kafka_server,