diff --git a/swh/loader/core/converters.py b/swh/loader/core/converters.py
--- a/swh/loader/core/converters.py
+++ b/swh/loader/core/converters.py
@@ -36,6 +36,11 @@
     if 'data' not in ret:
         ret['data'] = open(ret['path'], 'rb').read()
 
+    # Extra keys added by swh.model.from_disk, that are not accepted
+    # by swh-storage
+    ret.pop('perms', None)
+    ret.pop('path', None)
+
     ret['status'] = 'visible'
 
     return ret
diff --git a/swh/loader/core/tests/test_converters.py b/swh/loader/core/tests/test_converters.py
--- a/swh/loader/core/tests/test_converters.py
+++ b/swh/loader/core/tests/test_converters.py
@@ -50,6 +50,8 @@
         expected_content = obj.copy()
         expected_content['data'] = data
         expected_content['status'] = 'visible'
+        del expected_content['path']
+        del expected_content['perms']
 
         # when
         content = converters.content_for_storage(obj)
@@ -65,6 +67,7 @@
 
         expected_content = obj.copy()
         expected_content['status'] = 'visible'
+        del expected_content['perms']
 
         # when
         content = converters.content_for_storage(obj)