diff --git a/mempool/mempool.go b/mempool/mempool.go
index c473bf38..8a528626 100644
--- a/mempool/mempool.go
+++ b/mempool/mempool.go
@@ -67,6 +67,11 @@ type Config struct {
 	// chain tip within the best chain.
 	MedianTimePast func() time.Time
 
+	// CalcSequenceLock defines the function to use in order to generate
+	// the current sequence lock for the given transaction using the passed
+	// utxo view.
+	CalcSequenceLock func(*btcutil.Tx, *blockchain.UtxoViewpoint) (*blockchain.SequenceLock, error)
+
 	// SigCache defines a signature cache to use.
 	SigCache *txscript.SigCache
 
diff --git a/mempool/mempool_test.go b/mempool/mempool_test.go
index 29a0bf07..dd39f0ae 100644
--- a/mempool/mempool_test.go
+++ b/mempool/mempool_test.go
@@ -92,6 +92,17 @@ func (s *fakeChain) SetMedianTimePast(mtp time.Time) {
 	s.Unlock()
 }
 
+// CalcSequenceLock returns the current sequence lock for the passed
+// transaction associated with the fake chain instance.
+func (s *fakeChain) CalcSequenceLock(tx *btcutil.Tx,
+	view *blockchain.UtxoViewpoint) (*blockchain.SequenceLock, error) {
+
+	return &blockchain.SequenceLock{
+		Seconds:     -1,
+		BlockHeight: -1,
+	}, nil
+}
+
 // spendableOutput is a convenience type that houses a particular utxo and the
 // amount associated with it.
 type spendableOutput struct {
@@ -302,12 +313,13 @@ func newPoolHarness(chainParams *chaincfg.Params) (*poolHarness, []spendableOutp
 				MaxSigOpsPerTx:       blockchain.MaxSigOpsPerBlock / 5,
 				MinRelayTxFee:        1000, // 1 Satoshi per byte
 			},
-			ChainParams:    chainParams,
-			FetchUtxoView:  chain.FetchUtxoView,
-			BestHeight:     chain.BestHeight,
-			MedianTimePast: chain.MedianTimePast,
-			SigCache:       nil,
-			AddrIndex:      nil,
+			ChainParams:      chainParams,
+			FetchUtxoView:    chain.FetchUtxoView,
+			BestHeight:       chain.BestHeight,
+			MedianTimePast:   chain.MedianTimePast,
+			CalcSequenceLock: chain.CalcSequenceLock,
+			SigCache:         nil,
+			AddrIndex:        nil,
 		}),
 	}
 
@@ -328,6 +340,7 @@ func newPoolHarness(chainParams *chaincfg.Params) (*poolHarness, []spendableOutp
 		outputs = append(outputs, txOutToSpendableOut(coinbase, i))
 	}
 	harness.chain.SetHeight(int32(chainParams.CoinbaseMaturity) + curHeight)
+	harness.chain.SetMedianTimePast(time.Now())
 
 	return &harness, outputs, nil
 }
diff --git a/server.go b/server.go
index df55b034..9ebc3b00 100644
--- a/server.go
+++ b/server.go
@@ -2360,8 +2360,11 @@ func newServer(listenAddrs []string, db database.DB, chainParams *chaincfg.Param
 		FetchUtxoView:  s.blockManager.chain.FetchUtxoView,
 		BestHeight:     func() int32 { return bm.chain.BestSnapshot().Height },
 		MedianTimePast: func() time.Time { return bm.chain.BestSnapshot().MedianTime },
-		SigCache:       s.sigCache,
-		AddrIndex:      s.addrIndex,
+		CalcSequenceLock: func(tx *btcutil.Tx, view *blockchain.UtxoViewpoint) (*blockchain.SequenceLock, error) {
+			return bm.chain.CalcSequenceLock(tx, view, true)
+		},
+		SigCache:  s.sigCache,
+		AddrIndex: s.addrIndex,
 	}
 	s.txMemPool = mempool.New(&txC)