diff --git a/statistics/cmsketch_bench_test.go b/statistics/cmsketch_bench_test.go
index da4070ab98af4..e68d102ca57da 100644
--- a/statistics/cmsketch_bench_test.go
+++ b/statistics/cmsketch_bench_test.go
@@ -139,7 +139,7 @@ func benchmarkMergeGlobalStatsTopNByConcurrencyWithHists(partitions int, b *test
 }
 
 var benchmarkSizes = []int{100, 1000, 10000, 100000, 1000000, 10000000}
-var benchmarkConcurrencySizes = []int{100, 1000, 10000}
+var benchmarkConcurrencySizes = []int{100, 1000, 10000, 100000, 1000000, 10000000, 100000000}
 
 func BenchmarkMergePartTopN2GlobalTopNWithHists(b *testing.B) {
 	for _, size := range benchmarkSizes {