diff --git a/core/vm/gas.go b/core/vm/gas.go
index bba7058c7e233e2897bb4c9f63e0de1164cbc1e6..dba1b3a02fca8e9b7d7c7e654a049d9d7a75c19d 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.