diff --git a/common/constants.go b/common/constants.go
index 6175f51ab5..9590644ddb 100644
--- a/common/constants.go
+++ b/common/constants.go
@@ -21,7 +21,7 @@ const (
 )
 
 var TIP2019Block = big.NewInt(1050000)
-var IsTestnet bool = false
+var IsTestnet = false
 var StoreRewardFolder string
 var RollbackHash Hash
 var MinGasPrice int64
\ No newline at end of file