diff --git a/app/vmselect/promql/exec_test.go b/app/vmselect/promql/exec_test.go
index 6577acc27..6070fd1f6 100644
--- a/app/vmselect/promql/exec_test.go
+++ b/app/vmselect/promql/exec_test.go
@@ -46,7 +46,7 @@ func TestEscapeDotsInRegexpLabelFilters(t *testing.T) {
 	f("2", "2")
 	f(`foo.bar + 123`, `foo.bar + 123`)
 	f(`foo{bar=~"baz.xx.yyy"}`, `foo{bar=~"baz\\.xx\\.yyy"}`)
-	f(`foo(a.b{c="d.e",x=~"a.b.+[.a]",y!~"aaa.bb|cc.dd"}) + x.y(1,sum({x=~"aa.bb"}))`, `foo(a.b{c="d.e",x=~"a\\.b.+[\\.a]",y!~"aaa\\.bb|cc\\.dd"}) + x.y(1, sum({x=~"aa\\.bb"}))`)
+	f(`sum(a.b{c="d.e",x=~"a.b.+[.a]",y!~"aaa.bb|cc.dd"}) + avg_over_time(1,sum({x=~"aa.bb"}))`, `sum(a.b{c="d.e",x=~"a\\.b.+[\\.a]",y!~"aaa\\.bb|cc\\.dd"}) + avg_over_time(1, sum({x=~"aa\\.bb"}))`)
 }
 
 func TestExecSuccess(t *testing.T) {