diff --git a/core/vm/gas.go b/core/vm/gas.go
index bba7058c7..dba1b3a02 100644
--- a/core/vm/gas.go
+++ b/core/vm/gas.go
@@ -30,10 +30,6 @@ const (
 	GasMidStep     uint64 = 8
 	GasSlowStep    uint64 = 10
 	GasExtStep     uint64 = 20
-
-	GasReturn       uint64 = 0
-	GasStop         uint64 = 0
-	GasContractByte uint64 = 200
 )
 
 // calcGas returns the actual gas cost of the call.