diff --git a/src/Data/StaticBytes.hs b/src/Data/StaticBytes.hs
index b7de430..7e92329 100644
--- a/src/Data/StaticBytes.hs
+++ b/src/Data/StaticBytes.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE NoImplicitPrelude   #-}
+{-# LANGUAGE CPP                 #-}
 {-# LANGUAGE DeriveAnyClass      #-}
 {-# LANGUAGE DeriveDataTypeable  #-}
 {-# LANGUAGE DeriveGeneric       #-}
@@ -27,6 +28,9 @@ import           Data.ByteArray
 import qualified Data.ByteString as B
 import qualified Data.ByteString.Internal as B
 import qualified Data.Primitive.ByteArray as BA
+#if MIN_VERSION_GLASGOW_HASKELL(9,4,1,0)
+import           Data.Type.Equality ( type (~) )
+#endif
 import qualified Data.Vector.Primitive as VP
 import qualified Data.Vector.Storable as VS
 import qualified Data.Vector.Unboxed as VU