diff --git a/pkg/core/region.go b/pkg/core/region.go
index 2a8a3b531371..f827c2cb0fe5 100644
--- a/pkg/core/region.go
+++ b/pkg/core/region.go
@@ -1560,7 +1560,7 @@ const (
 )
 
 // GetStoreRegions gets all RegionInfo with a given storeID
-func (r *RegionsInfo) GetStoreRegionsByTypeInSubTree(storeID uint64, typ SubTreeRegionType) ([]*RegionInfo, err) {
+func (r *RegionsInfo) GetStoreRegionsByTypeInSubTree(storeID uint64, typ SubTreeRegionType) ([]*RegionInfo, error) {
 	r.st.RLock()
 	var regions []*RegionInfo
 	switch typ {
diff --git a/tools/pd-ctl/tests/region/region_test.go b/tools/pd-ctl/tests/region/region_test.go
index 109432ca9faa..2952e137f3b4 100644
--- a/tools/pd-ctl/tests/region/region_test.go
+++ b/tools/pd-ctl/tests/region/region_test.go
@@ -108,6 +108,11 @@ func TestRegion(t *testing.T) {
 	)
 	defer cluster.Destroy()
 
+	getRegionsByType := func(storeID uint64, regionType core.SubTreeRegionType) []*core.RegionInfo {
+		regions, _ := leaderServer.GetRaftCluster().GetStoreRegionsByTypeInSubTree(storeID, regionType)
+		return regions
+	}
+
 	var testRegionsCases = []struct {
 		args   []string
 		expect []*core.RegionInfo
@@ -118,11 +123,11 @@ func TestRegion(t *testing.T) {
 		{[]string{"region", "sibling", "2"}, leaderServer.GetAdjacentRegions(leaderServer.GetRegionInfoByID(2))},
 		// region store <store_id> command
 		{[]string{"region", "store", "1"}, leaderServer.GetStoreRegions(1)},
-		{[]string{"region", "store", "1", "--type=leader"}, leaderServer.GetRaftCluster().GetStoreRegionsByTypeInSubTree(1, core.LeaderInSubTree)},
-		{[]string{"region", "store", "1", "--type=follower"}, leaderServer.GetRaftCluster().GetStoreRegionsByTypeInSubTree(1, core.FollowerInSubTree)},
-		{[]string{"region", "store", "1", "--type=learner"}, leaderServer.GetRaftCluster().GetStoreRegionsByTypeInSubTree(1, core.LearnerInSubTree)},
-		{[]string{"region", "store", "1", "--type=witness"}, leaderServer.GetRaftCluster().GetStoreRegionsByTypeInSubTree(1, core.WitnessInSubTree)},
-		{[]string{"region", "store", "1", "--type=pending"}, leaderServer.GetRaftCluster().GetStoreRegionsByTypeInSubTree(1, core.PendingPeerInSubTree)},
+		{[]string{"region", "store", "1", "--type=leader"}, getRegionsByType(1, core.LeaderInSubTree)},
+		{[]string{"region", "store", "1", "--type=follower"}, getRegionsByType(1, core.FollowerInSubTree)},
+		{[]string{"region", "store", "1", "--type=learner"}, getRegionsByType(1, core.LearnerInSubTree)},
+		{[]string{"region", "store", "1", "--type=witness"}, getRegionsByType(1, core.WitnessInSubTree)},
+		{[]string{"region", "store", "1", "--type=pending"}, getRegionsByType(1, core.PendingPeerInSubTree)},
 		{[]string{"region", "store", "1", "--type=all"}, []*core.RegionInfo{r1, r2, r3, r4}},
 		// region check extra-peer command
 		{[]string{"region", "check", "extra-peer"}, []*core.RegionInfo{r1}},