diff --git a/tsdb/postings_for_matchers_cache_test.go b/tsdb/postings_for_matchers_cache_test.go
index c8e5355fd1..b715ff6923 100644
--- a/tsdb/postings_for_matchers_cache_test.go
+++ b/tsdb/postings_for_matchers_cache_test.go
@@ -364,7 +364,7 @@ func TestPostingsForMatchersCache(t *testing.T) {
 func BenchmarkPostingsForMatchersCache(b *testing.B) {
 	const (
 		numMatchers = 100
-		numPostings = 100
+		numPostings = 100000
 	)
 
 	var (