diff --git a/src/Prologue.hs b/src/Prologue.hs
index 69353fd7b..65e391c83 100644
--- a/src/Prologue.hs
+++ b/src/Prologue.hs
@@ -55,6 +55,7 @@ import Data.Hashable as X (Hashable, hash, hashUsing, hashWithSalt)
 import Data.Hashable.Lifted as X (Hashable1(..), hashWithSalt1)
 import Data.Monoid as X (First (..), Last (..), Monoid (..))
 import Data.Monoid.Generic as X
+import Data.Profunctor.Unsafe
 import Data.Proxy as X (Proxy (..))
 import Data.Semigroup as X (Semigroup (..))
 import Data.Traversable as X
@@ -85,6 +86,3 @@ eitherM :: Applicative f => (a -> f b) -> Either a b -> f b
 eitherM f = either f pure
 {-# INLINE eitherM #-}
 
-(#.) :: Coercible b c => (b -> c) -> (a -> b) -> (a -> c)
-(#.) _ = coerce
-{-# INLINE (#.) #-}