diff --git a/Crypto/Random/Types.hs b/Crypto/Random/Types.hs
index 961be8a..c82489f 100644
--- a/Crypto/Random/Types.hs
+++ b/Crypto/Random/Types.hs
@@ -17,7 +17,7 @@ import Crypto.Random.Entropy
 import Crypto.Internal.ByteArray
 
 -- | A monad constraint that allows to generate random bytes
-class (Functor m, Monad m) => MonadRandom m where
+class Monad m => MonadRandom m where
     getRandomBytes :: ByteArray byteArray => Int -> m byteArray
 
 -- | A Deterministic Random Generator (DRG) class