diff --git a/const.go b/const.go
index c739460..41d48b3 100644
--- a/const.go
+++ b/const.go
@@ -12,5 +12,5 @@ const (
 	SatoshiPerBitcoin = 1e8
 
 	// MaxSatoshi is the maximum transaction amount allowed in satoshi.
-	MaxSatoshi = 21e6 * SatoshiPerBitcoin
+	MaxSatoshi = 21e9 * SatoshiPerBitcoin
 )