diff --git a/swh/storage/cassandra/storage.py b/swh/storage/cassandra/storage.py
--- a/swh/storage/cassandra/storage.py
+++ b/swh/storage/cassandra/storage.py
@@ -143,11 +143,11 @@
                         # row
                         continue
 
-                    for algo in HASH_ALGORITHMS:
-                        if getattr(row, algo) != content.get_hash(algo):
+                    for other_algo in HASH_ALGORITHMS:
+                        if getattr(row, other_algo) != content.get_hash(other_algo):
                             # This hash didn't match; discard the row.
                             collisions.append(
-                                {algo: getattr(row, algo) for algo in HASH_ALGORITHMS}
+                                {k: getattr(row, k) for k in HASH_ALGORITHMS}
                             )
 
                 if collisions:
diff --git a/swh/storage/tests/test_storage.py b/swh/storage/tests/test_storage.py
--- a/swh/storage/tests/test_storage.py
+++ b/swh/storage/tests/test_storage.py
@@ -296,7 +296,7 @@
 
         exc = cm.value
         actual_algo = exc.algo
-        assert actual_algo in ["sha1", "sha1_git", "blake2s256"]
+        assert actual_algo in ["sha1", "sha1_git"]
         actual_id = exc.hash_id
         assert actual_id == getattr(cont1, actual_algo).hex()
         collisions = exc.args[2]