diff --git a/common/big.go b/common/big.go
index c813632618..31bd589eb7 100644
--- a/common/big.go
+++ b/common/big.go
@@ -20,14 +20,13 @@ import "math/big"
 
 // Common big integers often used
 var (
-	Big1    = big.NewInt(1)
-	Big2    = big.NewInt(2)
-	Big3    = big.NewInt(3)
-	Big0    = big.NewInt(0)
-	BigTrue = Big1
-	Big32   = big.NewInt(32)
-	Big256  = big.NewInt(0xff)
-	Big257  = big.NewInt(257)
+	Big1   = big.NewInt(1)
+	Big2   = big.NewInt(2)
+	Big3   = big.NewInt(3)
+	Big0   = big.NewInt(0)
+	Big32  = big.NewInt(32)
+	Big256 = big.NewInt(0xff)
+	Big257 = big.NewInt(257)
 )
 
 func String2Big(num string) *big.Int {
diff --git a/core/vm/instructions.go b/core/vm/instructions.go
index 79f71ceaa9..8b7bcc4d61 100644
--- a/core/vm/instructions.go
+++ b/core/vm/instructions.go
@@ -505,7 +505,7 @@ func opJump(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Sta
 }
 func opJumpi(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
 	pos, cond := stack.pop(), stack.pop()
-	if cond.Cmp(common.BigTrue) >= 0 {
+	if cond.BitLen() > 0 {
 		if !contract.jumpdests.has(contract.CodeHash, contract.Code, pos) {
 			nop := contract.GetOp(pos.Uint64())
 			return nil, fmt.Errorf("invalid jump destination (%v) %v", nop, pos)