diff --git a/build/params_butterfly.go b/build/params_butterfly.go
index 8875482ff..fee2738bf 100644
--- a/build/params_butterfly.go
+++ b/build/params_butterfly.go
@@ -55,11 +55,7 @@ const UpgradeHyggeHeight = -21
 const UpgradeLightningHeight = -22
 const UpgradeThunderHeight = -23
 
-// 2023-08-07
-const UpgradeWatermelonHeight = 900
-
-// ??????????
-const UpgradeWatermelonHeight = 999999999999999
+const UpgradeWatermelonHeight = 400
 
 var SupportedProofTypes = []abi.RegisteredSealProof{
 	abi.RegisteredSealProof_StackedDrg512MiBV1,