diff --git a/packages/test-sync/src/commonTest/kotlin/io/realm/kotlin/test/mongodb/common/AppTests.kt b/packages/test-sync/src/commonTest/kotlin/io/realm/kotlin/test/mongodb/common/AppTests.kt
index 6079e3edea..89376e8b61 100644
--- a/packages/test-sync/src/commonTest/kotlin/io/realm/kotlin/test/mongodb/common/AppTests.kt
+++ b/packages/test-sync/src/commonTest/kotlin/io/realm/kotlin/test/mongodb/common/AppTests.kt
@@ -386,7 +386,7 @@ class AppTests {
             // Create Realm in order to create the sync metadata Realm
             val user = app.asTestApp.createUserAndLogin()
             val syncConfig = SyncConfiguration
-                .Builder(user, setOf(ParentPk::class, ChildPk::class))
+                .Builder(user, FLEXIBLE_SYNC_SCHEMA)
                 .build()
             Realm.open(syncConfig).close()
 
@@ -423,7 +423,7 @@ class AppTests {
             // Create Realm in order to create the sync metadata Realm
             val user = app.asTestApp.createUserAndLogin()
             val syncConfig = SyncConfiguration
-                .Builder(user, setOf(ParentPk::class, ChildPk::class))
+                .Builder(user, FLEXIBLE_SYNC_SCHEMA)
                 .build()
             Realm.open(syncConfig).close()