diff --git a/lnwallet/reservation.go b/lnwallet/reservation.go
index 8aef594ce..31eb58dbb 100644
--- a/lnwallet/reservation.go
+++ b/lnwallet/reservation.go
@@ -143,7 +143,7 @@ func NewChannelReservation(capacity, fundingAmt, feePerKw btcutil.Amount,
 		initiator    bool
 	)
 
-	commitFee := (feePerKw * commitWeight) / 1000
+	commitFee := btcutil.Amount((int64(feePerKw) * commitWeight) / 1000)
 
 	// If we're the responder to a single-funder reservation, then we have
 	// no initial balance in the channel unless the remote party is pushing
diff --git a/lnwallet/wallet.go b/lnwallet/wallet.go
index 6f785498a..fb61d8d33 100644
--- a/lnwallet/wallet.go
+++ b/lnwallet/wallet.go
@@ -39,8 +39,8 @@ const (
 	// rotations, etc.
 	identityKeyIndex = hdkeychain.HardenedKeyStart + 2
 
-	commitWeight = btcutil.Amount(724)
-	htlcWeight   = 172
+	commitWeight int64 = 724
+	htlcWeight   int64 = 172
 )
 
 var (