diff --git a/installers/charm/keystone/src/charm.py b/installers/charm/keystone/src/charm.py
index 2a0a521..f908bbf 100755
--- a/installers/charm/keystone/src/charm.py
+++ b/installers/charm/keystone/src/charm.py
@@ -237,9 +237,9 @@
 
         credential_keys, fernet_keys = self._get_keys()
 
-        for (key_id, value) in enumerate(credential_keys):
+        for key_id, value in enumerate(credential_keys):
             credentials_files_builder.add_file(str(key_id), value)
-        for (key_id, value) in enumerate(fernet_keys):
+        for key_id, value in enumerate(fernet_keys):
             fernet_files_builder.add_file(str(key_id), value)
         return credentials_files_builder.build(), fernet_files_builder.build()