diff --git a/test/mobilizon_web/resolvers/event_resolver_test.exs b/test/mobilizon_web/resolvers/event_resolver_test.exs
index 848b4e9b0..637d5da8c 100644
--- a/test/mobilizon_web/resolvers/event_resolver_test.exs
+++ b/test/mobilizon_web/resolvers/event_resolver_test.exs
@@ -185,7 +185,7 @@ defmodule MobilizonWeb.Resolvers.EventResolverTest do
 
       query = """
       {
-        person(preferredUsername: "#{actor.preferred_username}") {
+        person(id: "#{actor.id}") {
           id,
           participations(eventId: #{event_id}) {
             id,
@@ -832,7 +832,7 @@ defmodule MobilizonWeb.Resolvers.EventResolverTest do
 
       query = """
       {
-        person(preferredUsername: "#{actor.preferred_username}") {
+        person(id: "#{actor.id}") {
           id,
           participations(eventId: #{event.id}) {
             id,
@@ -895,7 +895,7 @@ defmodule MobilizonWeb.Resolvers.EventResolverTest do
 
       query = """
       {
-        person(preferredUsername: "#{actor.preferred_username}") {
+        person(id: "#{actor.id}") {
           id,
           participations(eventId: #{event.id}) {
             role,
diff --git a/test/mobilizon_web/resolvers/participant_resolver_test.exs b/test/mobilizon_web/resolvers/participant_resolver_test.exs
index c1d6d1d6d..c0e69ea2f 100644
--- a/test/mobilizon_web/resolvers/participant_resolver_test.exs
+++ b/test/mobilizon_web/resolvers/participant_resolver_test.exs
@@ -164,7 +164,7 @@ defmodule MobilizonWeb.Resolvers.ParticipantResolverTest do
 
       query = """
       {
-        person(preferredUsername: "#{actor.preferred_username}") {
+        person(id: "#{actor.id}") {
             participations(eventId: "#{event.id}") {
               event {
                 uuid,
@@ -193,7 +193,7 @@ defmodule MobilizonWeb.Resolvers.ParticipantResolverTest do
 
       query = """
       {
-        person(preferredUsername: "#{actor2.preferred_username}") {
+        person(id: "#{actor2.id}") {
             participations(eventId: "#{event.id}") {
               event {
                 uuid,