diff --git a/bundles/opendkim/metadata.py b/bundles/opendkim/metadata.py
index eed1fbe..46a6c44 100644
--- a/bundles/opendkim/metadata.py
+++ b/bundles/opendkim/metadata.py
@@ -60,7 +60,7 @@ def keys(metadata):
                             crypto_serialization.Encoding.PEM,
                             crypto_serialization.PrivateFormat.PKCS8,
                             crypto_serialization.NoEncryption()
-                        ).decode(),
+                        ).decode()
                     )
                 )