diff --git a/lnwire/lnwire.go b/lnwire/lnwire.go
index c9fdb962..3e5be3df 100644
--- a/lnwire/lnwire.go
+++ b/lnwire/lnwire.go
@@ -16,17 +16,17 @@ var MAX_SLICE_LENGTH = 65535
 // Actual pkScript, not redeemScript
 type PkScript []byte
 
-type HTLCKey uint64
+type HTLCKey int64
 type CommitHeight uint64
 
 // Subsatoshi amount (Micro-Satoshi, 1/1000th)
 // Should be a signed int to account for negative fees
-// 
+//
 // "In any science-fiction movie, anywhere in the galaxy, currency is referred
 // to as 'credits.'"
 // 	--Sam Humphries. Ebert, Roger (1999). Ebert's bigger little movie
 // 	glossary. Andrews McMeel. p. 172.
-// 
+//
 // https:// en.wikipedia.org/wiki/List_of_fictional_currencies
 // https:// en.wikipedia.org/wiki/Fictional_currency#Trends_in_the_use_of_fictional_currencies
 // http:// tvtropes.org/pmwiki/pmwiki.php/Main/WeWillSpendCreditsInTheFuture