diff --git a/benchs/Bench.hs b/benchs/Bench.hs
index 7b96e57..10c91d5 100644
--- a/benchs/Bench.hs
+++ b/benchs/Bench.hs
@@ -30,6 +30,7 @@ import qualified Data.ByteString as B
 
 import qualified Crypto.PubKey.ECC.P256 as P256
 
+import Number.F2m
 
 data HashAlg = forall alg . HashAlgorithm alg => HashAlg alg