diff --git a/core/src/Datarekisteri/Core/Types.hs b/core/src/Datarekisteri/Core/Types.hs
index 885e4e8..685cedd 100644
--- a/core/src/Datarekisteri/Core/Types.hs
+++ b/core/src/Datarekisteri/Core/Types.hs
@@ -99,7 +99,18 @@ instance FromJSON Scope where parseJSON = scalarFromJSON <=< parseJSON
 data Permission = None
                 | ReadOnly
                 | ReadWrite
-                deriving (Show, Eq, Ord, Read)
+                deriving (Show, Eq, Ord, Read, Generic)
+
+instance DecodeScalar Permission where
+    decodeScalar (String s) = maybe (Left $ "invalid Permission: \"" <> s <> "\"") Right $ readMaybe (toString s)
+    decodeScalar _ = Left "Invalid type for Permission, should be string"
+
+instance EncodeScalar Permission where
+    encodeScalar = String . show
+
+instance GQLType Permission where type KIND Permission = SCALAR
+instance ToJSON Permission where toJSON = scalarToJSON
+instance FromJSON Permission where parseJSON = scalarFromJSON <=< parseJSON
 
 readPermission :: Text -> Maybe (Map Scope Permission)
 readPermission = rightToMaybe . readEither . toString