diff --git a/promql/bench_test.go b/promql/bench_test.go
index bd6728029..33523b2db 100644
--- a/promql/bench_test.go
+++ b/promql/bench_test.go
@@ -165,6 +165,9 @@ func rangeQueryCases() []benchCase {
 		{
 			expr: "sum(a_X)",
 		},
+		{
+			expr: "avg(a_X)",
+		},
 		{
 			expr: "sum without (l)(h_X)",
 		},