diff --git a/swh/model/identifiers.py b/swh/model/identifiers.py
index f8a87a1351b9ad5692c1b8ecd448e9e0e13ad8b1..485e3bb40eb74894f616ddeb0177cd04aca45568 100644
--- a/swh/model/identifiers.py
+++ b/swh/model/identifiers.py
@@ -605,7 +605,7 @@ def persistent_identifier(type, object, version=1):
 
     Args:
         type (str): Object's type
-        object (str): Object's dict representation
+        object (dict): Object's dict representation
         version (int): persistent identifier version (default to 1)
 
     Returns: