diff --git a/plan/plans/from_test.go b/plan/plans/from_test.go
index e816c871c3..6b9ac7b492 100644
--- a/plan/plans/from_test.go
+++ b/plan/plans/from_test.go
@@ -69,11 +69,9 @@ func (p *testFromSuit) ClearValue(key fmt.Stringer) {}
 
 var _ = Suite(&testFromSuit{})
 
-var store kv.Storage
-
 func (p *testFromSuit) SetUpSuite(c *C) {
 	var err error
-	store, err = tidb.NewStore(tidb.EngineGoLevelDBMemory)
+	store, err := tidb.NewStore(tidb.EngineGoLevelDBMemory)
 	c.Assert(err, IsNil)
 	p.vars = map[string]interface{}{}
 	p.txn, _ = store.Begin()
diff --git a/plan/plans/show_test.go b/plan/plans/show_test.go
index bcd0244ddc..a1b4740730 100644
--- a/plan/plans/show_test.go
+++ b/plan/plans/show_test.go
@@ -52,7 +52,7 @@ var _ = Suite(&testShowSuit{})
 
 func (p *testShowSuit) SetUpSuite(c *C) {
 	var err error
-	store, err = tidb.NewStore(tidb.EngineGoLevelDBMemory)
+	store, err := tidb.NewStore(tidb.EngineGoLevelDBMemory)
 	c.Assert(err, IsNil)
 	p.vars = map[string]interface{}{}
 	p.txn, _ = store.Begin()