diff --git a/core/state_quota.go b/core/state_quota.go
index 750c855f50..008223470c 100644
--- a/core/state_quota.go
+++ b/core/state_quota.go
@@ -28,6 +28,10 @@ import (
 	"math/big"
 )
 
+var (
+	big0 = big.NewInt(0)
+)
+
 func (st *StateTransition) preQuotaCheck() error {
 	if st.uploading() {
 		// log.Debug("state_transition", "uploading", st.uploading(), "st.state.GetNum(st.to())", st.state.GetNum(st.to()))
diff --git a/core/state_transition.go b/core/state_transition.go
index ec94cce29b..2499e4798c 100644
--- a/core/state_transition.go
+++ b/core/state_transition.go
@@ -91,9 +91,6 @@ The state transitioning model does all the necessary work to work out a valid ne
 5) Run Script section
 6) Derive new state root
 */
-var (
-	big0 = big.NewInt(0)
-)
 
 // StateTransition is the state of current tx in vm
 type StateTransition struct {