diff --git a/pkg/store/bucket.go b/pkg/store/bucket.go
index c4b27ed3791..d4b92eb75f0 100644
--- a/pkg/store/bucket.go
+++ b/pkg/store/bucket.go
@@ -1022,7 +1022,7 @@ func coverInterval(min, max int64, blocks []*bucketBlock) []*bucketBlock {
 		return []*bucketBlock{}
 	}
 
-	coveringBlocks := []*bucketBlock{}
+	var coveringBlocks []*bucketBlock
 	for _, b := range blocks {
 		if b.meta.MaxTime <= min {
 			continue