diff --git a/nix/cardano-ledger-core--Arbitrary-PoolMetadata.diff b/nix/cardano-ledger-core--Arbitrary-PoolMetadata.diff
new file mode 100644
index 0000000..f4e9783
--- /dev/null
+++ b/nix/cardano-ledger-core--Arbitrary-PoolMetadata.diff
@@ -0,0 +1,21 @@
+diff --git a/testlib/Test/Cardano/Ledger/Core/Arbitrary.hs b/testlib/Test/Cardano/Ledger/Core/Arbitrary.hs
+index a0e9c8359..9943c7b66 100644
+--- a/testlib/Test/Cardano/Ledger/Core/Arbitrary.hs
++++ b/testlib/Test/Cardano/Ledger/Core/Arbitrary.hs
+@@ -142,6 +142,7 @@ import Cardano.Ledger.UTxO (UTxO (..))
+ import Control.Monad (replicateM)
+ import Control.Monad.Identity (Identity)
+ import Control.Monad.Trans.Fail.String (errorFail)
++import qualified Data.ByteString
+ import Data.GenValidity
+ import Data.Int (Int64)
+ import Data.Map.Strict (Map)
+@@ -497,7 +498,7 @@ instance Crypto c => Arbitrary (PoolParams c) where
+       <*> arbitrary
+ 
+ instance Arbitrary PoolMetadata where
+-  arbitrary = PoolMetadata <$> arbitrary <*> arbitrary
++  arbitrary = PoolMetadata <$> arbitrary <*> (Data.ByteString.pack <$> vectorOf 32 arbitrary)
+ 
+ instance Arbitrary StakePoolRelay where
+   arbitrary = genericArbitraryU
diff --git a/nix/cardano-node--apply-patches.diff b/nix/cardano-node--apply-patches.diff
new file mode 100644
index 0000000..2f89203
--- /dev/null
+++ b/nix/cardano-node--apply-patches.diff
@@ -0,0 +1,16 @@
+diff --git a/nix/haskell.nix b/nix/haskell.nix
+index ec137f412..cdeb9877b 100644
+--- a/nix/haskell.nix
++++ b/nix/haskell.nix
+@@ -110,6 +110,11 @@ let
+       #
+       modules =
+         [
++          ({ lib, pkgs, ... }: {
++            packages.cardano-ledger-core.patches = [
++              ./cardano-ledger-core--Arbitrary-PoolMetadata.diff
++            ];
++          })
+           ({ lib, pkgs, ... }: {
+             packages.cardano-tracer.package.buildable = with pkgs.stdenv.hostPlatform; lib.mkForce (!isMusl);
+             packages.cardano-node-chairman.components.tests.chairman-tests.buildable = lib.mkForce pkgs.stdenv.hostPlatform.isUnix;
diff --git a/nix/internal.nix b/nix/internal.nix
index 4f37769..d502a74 100644
--- a/nix/internal.nix
+++ b/nix/internal.nix
@@ -39,6 +39,9 @@ in rec {
             cp -r ${../testgen-hs} ./testgen-hs
             sed -r '/^packages:/ a\  testgen-hs' -i cabal.project
             sed -r 's/other-modules:\s*/                    , /g' -i cardano-submit-api/cardano-submit-api.cabal
+
+            patch -p1 -i ${./cardano-node--apply-patches.diff}
+            cp  ${./cardano-ledger-core--Arbitrary-PoolMetadata.diff} nix/cardano-ledger-core--Arbitrary-PoolMetadata.diff
           '');
           inherit (unpatched) rev shortRev lastModified lastModifiedDate;
         };