diff --git a/cuckoo-filter.cabal b/cuckoo-filter.cabal
--- a/cuckoo-filter.cabal
+++ b/cuckoo-filter.cabal
@@ -4,10 +4,10 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 10e4a9c36733e569b2f34e1705f635a2195378da353585ba96b142feb54122e3
+-- hash: 1cdf9769c1d7699894d243efd2497e42d871f60f884bdffb2ef052766c952336
 
 name:           cuckoo-filter
-version:        0.2.0.1
+version:        0.2.0.2
 synopsis:       Pure and impure Cuckoo Filter
 description:    Please see the README on Github at <https://github.com/ChrisCoffey/cuckoo-filter#readme>
 category:       Data
diff --git a/test/Spec.hs b/test/Spec.hs
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -6,7 +6,7 @@
 import Control.Monad (foldM, replicateM)
 import Data.Functor.Identity (runIdentity)
 import Data.Hashable (Hashable)
-import Data.Maybe (isJust, isNothing)
+import Data.Maybe (isJust, isNothing, fromMaybe)
 import Data.Word
 import Numeric.Natural (Natural)
 
@@ -20,7 +20,7 @@
 tests = testGroup "Data.CuckooFilter" [
     -- testProperty "insert x increases load factor" undefined,
     testProperty "insert x >> delete x is idempotent" $ \s -> runIdentity $ do
-        Just f <- insert defaultFilter s
+        f <- fromMaybe defaultFilter <$> insert defaultFilter s
         f' <- delete f s
         not <$> member s f'