diff --git a/swh/model/hypothesis_strategies.py b/swh/model/hypothesis_strategies.py
--- a/swh/model/hypothesis_strategies.py
+++ b/swh/model/hypothesis_strategies.py
@@ -132,7 +132,7 @@
     (status, data, reason) = draw(one_of(
         tuples(just('visible'), binary(), none()),
         tuples(just('absent'), none(), pgsql_text()),
-        tuples(just('hidden'), none(), none()),
+        tuples(just('hidden'), binary(), none()),
     ))
 
     return draw(builds(
diff --git a/swh/model/tests/test_hypothesis_strategies.py b/swh/model/tests/test_hypothesis_strategies.py
--- a/swh/model/tests/test_hypothesis_strategies.py
+++ b/swh/model/tests/test_hypothesis_strategies.py
@@ -49,7 +49,7 @@
                 set(DEFAULT_ALGORITHMS) | {'length', 'status', 'reason'}
         elif object_['status'] == 'hidden':
             assert set(object_) == \
-                set(DEFAULT_ALGORITHMS) | {'length', 'status'}
+                set(DEFAULT_ALGORITHMS) | {'length', 'status', 'data'}
         else:
             assert False, object_
     elif obj_type == 'release':