diff --git a/deriving-aeson.cabal b/deriving-aeson.cabal
--- a/deriving-aeson.cabal
+++ b/deriving-aeson.cabal
@@ -1,6 +1,6 @@
 cabal-version:       2.4
 name:                deriving-aeson
-version:             0.2.6
+version:             0.2.6.1
 synopsis:            Type driven generic aeson instance customisation
 description:         This package provides a newtype wrapper with
   FromJSON/ToJSON instances customisable via a phantom type parameter.
diff --git a/src/Deriving/Aeson.hs b/src/Deriving/Aeson.hs
--- a/src/Deriving/Aeson.hs
+++ b/src/Deriving/Aeson.hs
@@ -164,7 +164,7 @@
   aesonOptions = (aesonOptions @xs) { allNullaryToStringTag = False }
 
 instance (KnownSymbol t, KnownSymbol c, AesonOptions xs) => AesonOptions (SumTaggedObject t c ': xs) where
-  aesonOptions = (aesonOptions @xs) { sumEncoding = TaggedObject (symbolVal (Proxy @ t)) (symbolVal (Proxy @ c)) }
+  aesonOptions = (aesonOptions @xs) { sumEncoding = TaggedObject (symbolVal (Proxy @t)) (symbolVal (Proxy @c)) }
 
 instance (AesonOptions xs) => AesonOptions (SumUntaggedValue ': xs) where
   aesonOptions = (aesonOptions @xs) { sumEncoding = UntaggedValue }