diff --git a/hydra-tx/test/Hydra/Tx/Contract/Increment.hs b/hydra-tx/test/Hydra/Tx/Contract/Increment.hs
index 7233e63dd99..3458de22c26 100644
--- a/hydra-tx/test/Hydra/Tx/Contract/Increment.hs
+++ b/hydra-tx/test/Hydra/Tx/Contract/Increment.hs
@@ -23,7 +23,7 @@ import Hydra.Ledger.Cardano.Time (slotNoFromUTCTime)
 import Hydra.Plutus.Orphans ()
 import Hydra.Tx.ContestationPeriod (ContestationPeriod, toChain)
 import Hydra.Tx.Contract.Deposit (depositDeadline, healthyDepositTx)
-import Hydra.Tx.Crypto (HydraKey, MultiSignature (..), aggregate, sign)
+import Hydra.Tx.Crypto (HydraKey)
 import Hydra.Tx.HeadId (headIdToCurrencySymbol, mkHeadId)
 import Hydra.Tx.HeadParameters (HeadParameters (..))
 import Hydra.Tx.Increment (
@@ -96,9 +96,6 @@ healthyParties = deriveParty <$> healthySigningKeys
 healthyOnChainParties :: [OnChain.Party]
 healthyOnChainParties = partyToChain <$> healthyParties
 
-healthySignature :: MultiSignature (Snapshot Tx)
-healthySignature = aggregate [sign sk healthySnapshot | sk <- healthySigningKeys]
-
 healthySnapshotNumber :: SnapshotNumber
 healthySnapshotNumber = 1