diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1b4ee32d8e..cf15dbcabf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 ### Fixed
 
 - [#6650](https://github.com/thanos-io/thanos/pull/6650) Store: fix error handling in decodePostings
+- [#6655](https://github.com/thanos-io/thanos/pull/6655) Store: fix bufio pool handling
 
 ### Added
 
diff --git a/pkg/store/bucket.go b/pkg/store/bucket.go
index 780a2013aa..3db587f742 100644
--- a/pkg/store/bucket.go
+++ b/pkg/store/bucket.go
@@ -2792,13 +2792,13 @@ func (r *bucketIndexReader) fetchPostings(ctx context.Context, keys []labels.Lab
 		// We assume index does not have any ptrs that has 0 length.
 		length := int64(part.End) - start
 
-		brdr := bufioReaderPool.Get().(*bufio.Reader)
-		defer bufioReaderPool.Put(brdr)
-
 		// Fetch from object storage concurrently and update stats and posting list.
 		g.Go(func() error {
 			begin := time.Now()
 
+			brdr := bufioReaderPool.Get().(*bufio.Reader)
+			defer bufioReaderPool.Put(brdr)
+
 			partReader, err := r.block.bkt.GetRange(ctx, r.block.indexFilename(), start, length)
 			if err != nil {
 				return errors.Wrap(err, "read postings range")