diff --git a/src/pyop/authz_state.py b/src/pyop/authz_state.py
index d3c4a95..5eb999e 100644
--- a/src/pyop/authz_state.py
+++ b/src/pyop/authz_state.py
@@ -271,7 +271,7 @@ def get_subject_identifier(self, subject_type, user_id, sector_identifier=None):
                 new_sub = self._subject_identifier_factory.create_public_identifier(user_id)
                 self.subject_identifiers[user_id] = {'public': new_sub}
 
-                logger.debug('created new public sub=% for user_id=%s',
+                logger.debug('created new public sub=%s for user_id=%s',
                              self.subject_identifiers[user_id]['public'], user_id)
             sub = self.subject_identifiers[user_id]['public']
             logger.debug('returning public sub=%s', sub)