diff --git a/lib/core/test/unit/Cardano/Wallet/Primitive/AddressDiscovery/SequentialSpec.hs b/lib/core/test/unit/Cardano/Wallet/Primitive/AddressDiscovery/SequentialSpec.hs
index 8c08167567a..66b466b2abd 100644
--- a/lib/core/test/unit/Cardano/Wallet/Primitive/AddressDiscovery/SequentialSpec.hs
+++ b/lib/core/test/unit/Cardano/Wallet/Primitive/AddressDiscovery/SequentialSpec.hs
@@ -26,7 +26,9 @@ import Cardano.Wallet.Primitive.AddressDerivation
     ( AccountingStyle (..)
     , DelegationAddress (..)
     , Depth (..)
+    , DerivationType (..)
     , HardDerivation (..)
+    , Index
     , KeyFingerprint
     , MkKeyFingerprint (..)
     , NetworkDiscriminant (..)
@@ -103,7 +105,6 @@ import Test.QuickCheck
     , Positive (..)
     , Property
     , arbitraryBoundedEnum
-    , arbitraryBoundedEnum
     , checkCoverage
     , choose
     , classify
@@ -144,6 +145,9 @@ spec = do
         it "defaultAddressPoolGap is valid"
             (property prop_defaultValid)
 
+    describe "DerivationPrefix" $ do
+        textRoundtrip (Proxy @DerivationPrefix)
+
     let styles =
             [ Style (Proxy @'UTxOExternal)
             , Style (Proxy @'UTxOInternal)
@@ -640,6 +644,16 @@ instance Arbitrary AddressState where
     shrink _ = []
     arbitrary = genericArbitrary
 
+instance Arbitrary DerivationPrefix where
+    arbitrary = fmap DerivationPrefix $ (,,)
+        <$> arbitrary
+        <*> arbitrary
+        <*> arbitrary
+
+instance Arbitrary (Index 'Hardened depth) where
+    shrink _ = []
+    arbitrary = arbitraryBoundedEnum
+
 -- | In this context, Arbitrary addresses are either some known addresses
 -- derived from "our account key", or they just are some arbitrary addresses
 -- that are unknown to us.