diff --git a/routing/payment_session.go b/routing/payment_session.go
index 117523e91..b1d8a9b03 100644
--- a/routing/payment_session.go
+++ b/routing/payment_session.go
@@ -8,6 +8,10 @@ import (
 	"github.com/lightningnetwork/lnd/routing/route"
 )
 
+// BlockPadding is used to increment the finalCltvDelta value for the last hop
+// to prevent an HTLC being failed if some blocks are mined while it's in-flight.
+const BlockPadding uint16 = 3
+
 // PaymentSession is used during SendPayment attempts to provide routes to
 // attempt. It also defines methods to give the PaymentSession additional
 // information learned during the previous attempts.
@@ -65,6 +69,10 @@ func (p *paymentSession) RequestRoute(payment *LightningPayment,
 		return nil, fmt.Errorf("pre-built route already tried")
 	}
 
+	// Add BlockPadding to the finalCltvDelta so that the receiving node
+	// does not reject the HTLC if some blocks are mined while it's in-flight.
+	finalCltvDelta += BlockPadding
+
 	// If a route cltv limit was specified, we need to subtract the final
 	// delta before passing it into path finding. The optimal path is
 	// independent of the final cltv delta and the path finding algorithm is