diff --git a/lnwire/msat.go b/lnwire/msat.go
index 1a1e21e0..9ab0e31d 100644
--- a/lnwire/msat.go
+++ b/lnwire/msat.go
@@ -8,7 +8,7 @@ import (
 
 // mSatScale is a value that's used to scale satoshis to milli-satoshis, and
 // the other way around.
-const mSatScale int64 = 1000
+const mSatScale uint64 = 1000
 
 // MilliSatoshi are the native unit of the Lightning Network. A milli-satoshi
 // is simply 1/1000th of a satoshi. There are 1000 milli-satoshis in a single
@@ -16,12 +16,12 @@ const mSatScale int64 = 1000
 // milli-satoshis. As milli-satoshis aren't deliverable on the native
 // blockchain, before settling to broadcasting, the values are rounded down to
 // the nearest satoshi.
-type MilliSatoshi int64
+type MilliSatoshi uint64
 
 // NewMSatFromSatoshis creates a new MilliSatoshi instance from a target amount
 // of satoshis.
 func NewMSatFromSatoshis(sat btcutil.Amount) MilliSatoshi {
-	return MilliSatoshi(int64(sat) * mSatScale)
+	return MilliSatoshi(uint64(sat) * mSatScale)
 }
 
 // ToBTC converts the target MilliSatoshi amount to its corresponding value
@@ -34,10 +34,12 @@ func (m MilliSatoshi) ToBTC() float64 {
 // ToSatoshis converts the target MilliSatoshi amount to satoshis. Simply, this
 // sheds a factor of 1000 from the mSAT amount in order to convert it to SAT.
 func (m MilliSatoshi) ToSatoshis() btcutil.Amount {
-	return btcutil.Amount(int64(m) / mSatScale)
+	return btcutil.Amount(uint64(m) / mSatScale)
 }
 
 // String returns the string representation of the mSAT amount.
 func (m MilliSatoshi) String() string {
-	return fmt.Sprintf("%v mSAT", int64(m))
+	return fmt.Sprintf("%v mSAT", uint64(m))
 }
+
+// TODO(roasbeef): extend with arithmetic operations?