diff --git a/lib/Hikaru/Types.hs b/lib/Hikaru/Types.hs
index dfa9d36b28783cf7ee2533ceb37128218bbb59a9..7f26f1287b6a954935896f0a63409894a5f8cbb2 100644
--- a/lib/Hikaru/Types.hs
+++ b/lib/Hikaru/Types.hs
@@ -114,10 +114,6 @@ where
                       _else -> Nothing
     {-# INLINE fromParam #-}
 
-  instance FromParam String where
-    fromParam = Just . unpack
-    {-# INLINE fromParam #-}
-
   instance FromParam Text where
     fromParam = Just . id
     {-# INLINE fromParam #-}
@@ -213,10 +209,6 @@ where
     toParam char = pack [char]
     {-# INLINE toParam #-}
 
-  instance ToParam String where
-    toParam = pack
-    {-# INLINE toParam #-}
-
   instance ToParam Text where
     toParam = id
     {-# INLINE toParam #-}