diff --git a/pkg/store/bucket.go b/pkg/store/bucket.go
index 59d943b58f..5a6f31c42d 100644
--- a/pkg/store/bucket.go
+++ b/pkg/store/bucket.go
@@ -3655,7 +3655,7 @@ func (s queryStats) merge(o *queryStats) *queryStats {
 	s.ChunksFetchedSizeSum += o.ChunksFetchedSizeSum
 	s.chunksFetchCount += o.chunksFetchCount
 	s.ChunksFetchDurationSum += o.ChunksFetchDurationSum
-	s.ChunksDownloadLatencySum += s.ChunksDownloadLatencySum
+	s.ChunksDownloadLatencySum += o.ChunksDownloadLatencySum
 
 	s.GetAllDuration += o.GetAllDuration
 	s.mergedSeriesCount += o.mergedSeriesCount
diff --git a/pkg/store/bucket_test.go b/pkg/store/bucket_test.go
index 682913b246..3df9359bf4 100644
--- a/pkg/store/bucket_test.go
+++ b/pkg/store/bucket_test.go
@@ -3485,3 +3485,123 @@ func TestBucketStoreDedupOnBlockSeriesSet(t *testing.T) {
 	}))
 	testutil.Equals(t, 2, len(srv.SeriesSet))
 }
+
+func TestQueryStatsMerge(t *testing.T) {
+	s := &queryStats{
+		blocksQueried:                      1,
+		postingsTouched:                    1,
+		PostingsTouchedSizeSum:             1,
+		postingsToFetch:                    1,
+		postingsFetched:                    1,
+		PostingsFetchedSizeSum:             1,
+		postingsFetchCount:                 1,
+		PostingsFetchDurationSum:           1,
+		cachedPostingsCompressions:         1,
+		cachedPostingsCompressionErrors:    1,
+		CachedPostingsOriginalSizeSum:      1,
+		CachedPostingsCompressedSizeSum:    1,
+		CachedPostingsCompressionTimeSum:   1,
+		cachedPostingsDecompressions:       1,
+		cachedPostingsDecompressionErrors:  1,
+		CachedPostingsDecompressionTimeSum: 1,
+		seriesTouched:                      1,
+		SeriesTouchedSizeSum:               1,
+		seriesFetched:                      1,
+		SeriesFetchedSizeSum:               1,
+		seriesFetchCount:                   1,
+		SeriesFetchDurationSum:             1,
+		SeriesDownloadLatencySum:           1,
+		chunksTouched:                      1,
+		ChunksTouchedSizeSum:               1,
+		chunksFetched:                      1,
+		ChunksFetchedSizeSum:               1,
+		chunksFetchCount:                   1,
+		ChunksFetchDurationSum:             1,
+		ChunksDownloadLatencySum:           1,
+		GetAllDuration:                     1,
+		mergedSeriesCount:                  1,
+		mergedChunksCount:                  1,
+		MergeDuration:                      1,
+		DataDownloadedSizeSum:              1,
+	}
+
+	o := &queryStats{
+		blocksQueried:                      100,
+		postingsTouched:                    100,
+		PostingsTouchedSizeSum:             100,
+		postingsToFetch:                    100,
+		postingsFetched:                    100,
+		PostingsFetchedSizeSum:             100,
+		postingsFetchCount:                 100,
+		PostingsFetchDurationSum:           100,
+		cachedPostingsCompressions:         100,
+		cachedPostingsCompressionErrors:    100,
+		CachedPostingsOriginalSizeSum:      100,
+		CachedPostingsCompressedSizeSum:    100,
+		CachedPostingsCompressionTimeSum:   100,
+		cachedPostingsDecompressions:       100,
+		cachedPostingsDecompressionErrors:  100,
+		CachedPostingsDecompressionTimeSum: 100,
+		seriesTouched:                      100,
+		SeriesTouchedSizeSum:               100,
+		seriesFetched:                      100,
+		SeriesFetchedSizeSum:               100,
+		seriesFetchCount:                   100,
+		SeriesFetchDurationSum:             100,
+		SeriesDownloadLatencySum:           100,
+		chunksTouched:                      100,
+		ChunksTouchedSizeSum:               100,
+		chunksFetched:                      100,
+		ChunksFetchedSizeSum:               100,
+		chunksFetchCount:                   100,
+		ChunksFetchDurationSum:             100,
+		ChunksDownloadLatencySum:           100,
+		GetAllDuration:                     100,
+		mergedSeriesCount:                  100,
+		mergedChunksCount:                  100,
+		MergeDuration:                      100,
+		DataDownloadedSizeSum:              100,
+	}
+
+	// Expected stats.
+	e := &queryStats{
+		blocksQueried:                      101,
+		postingsTouched:                    101,
+		PostingsTouchedSizeSum:             101,
+		postingsToFetch:                    101,
+		postingsFetched:                    101,
+		PostingsFetchedSizeSum:             101,
+		postingsFetchCount:                 101,
+		PostingsFetchDurationSum:           101,
+		cachedPostingsCompressions:         101,
+		cachedPostingsCompressionErrors:    101,
+		CachedPostingsOriginalSizeSum:      101,
+		CachedPostingsCompressedSizeSum:    101,
+		CachedPostingsCompressionTimeSum:   101,
+		cachedPostingsDecompressions:       101,
+		cachedPostingsDecompressionErrors:  101,
+		CachedPostingsDecompressionTimeSum: 101,
+		seriesTouched:                      101,
+		SeriesTouchedSizeSum:               101,
+		seriesFetched:                      101,
+		SeriesFetchedSizeSum:               101,
+		seriesFetchCount:                   101,
+		SeriesFetchDurationSum:             101,
+		SeriesDownloadLatencySum:           101,
+		chunksTouched:                      101,
+		ChunksTouchedSizeSum:               101,
+		chunksFetched:                      101,
+		ChunksFetchedSizeSum:               101,
+		chunksFetchCount:                   101,
+		ChunksFetchDurationSum:             101,
+		ChunksDownloadLatencySum:           101,
+		GetAllDuration:                     101,
+		mergedSeriesCount:                  101,
+		mergedChunksCount:                  101,
+		MergeDuration:                      101,
+		DataDownloadedSizeSum:              101,
+	}
+
+	output := s.merge(o)
+	testutil.Equals(t, e, output)
+}