diff --git a/Tests/Certificate.hs b/Tests/Certificate.hs
index 1d8a97e..4db18d0 100644
--- a/Tests/Certificate.hs
+++ b/Tests/Certificate.hs
@@ -6,10 +6,8 @@ module Tests.Certificate
 import Test.QuickCheck
 import qualified Data.Certificate.X509 as X509
 import qualified Data.Certificate.X509.Cert as Cert
-import Control.Monad
 import Data.Time.Calendar (fromGregorian)
 import Data.Time.Clock (secondsToDiffTime)
-import qualified Data.ByteString as B
 
 import Tests.PubKey