diff --git a/tests/integration/integration_test.go b/tests/integration/integration_test.go
index 4f49408157..34a975de44 100644
--- a/tests/integration/integration_test.go
+++ b/tests/integration/integration_test.go
@@ -19,6 +19,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"slices"
 	"strconv"
 	"strings"
 	"sync/atomic"
@@ -40,6 +41,7 @@ import (
 	"forgejo.org/routers"
 	"forgejo.org/services/auth/source/remote"
 	gitea_context "forgejo.org/services/context"
+	"forgejo.org/services/mailer"
 	user_service "forgejo.org/services/user"
 	"forgejo.org/tests"
 
@@ -694,3 +696,9 @@ func GetHTMLTitle(t testing.TB, session *TestSession, urlStr string) string {
 	doc := NewHTMLParser(t, resp.Body)
 	return doc.Find("head title").Text()
 }
+
+func SortMailerMessages(msgs []*mailer.Message) {
+	slices.SortFunc(msgs, func(a, b *mailer.Message) int {
+		return strings.Compare(b.To, a.To)
+	})
+}
diff --git a/tests/integration/pull_review_test.go b/tests/integration/pull_review_test.go
index 0c05b3da37..603252f45f 100644
--- a/tests/integration/pull_review_test.go
+++ b/tests/integration/pull_review_test.go
@@ -680,6 +680,7 @@ func TestPullRequestReplyMail(t *testing.T) {
 			called := false
 			defer test.MockVariableValue(&mailer.SendAsync, func(msgs ...*mailer.Message) {
 				assert.Len(t, msgs, 2)
+				SortMailerMessages(msgs)
 				assert.Equal(t, "user1@example.com", msgs[0].To)
 				assert.Equal(t, "Re: [user2/repo1] issue2 (PR #2)", msgs[0].Subject)
 				assert.Contains(t, msgs[0].Body, "Notification time!")
@@ -708,6 +709,7 @@ func TestPullRequestReplyMail(t *testing.T) {
 			called := false
 			defer test.MockVariableValue(&mailer.SendAsync, func(msgs ...*mailer.Message) {
 				assert.Len(t, msgs, 2)
+				SortMailerMessages(msgs)
 				assert.Equal(t, "user1@example.com", msgs[0].To)
 				assert.Equal(t, "Re: [user2/repo1] issue2 (PR #2)", msgs[0].Subject)
 				assert.Contains(t, msgs[0].Body, "Notification time 2!")