diff --git a/src/main/kotlin/com/faforever/userservice/backend/hydra/HydraService.kt b/src/main/kotlin/com/faforever/userservice/backend/hydra/HydraService.kt
index cc814b1a..b9b4981d 100644
--- a/src/main/kotlin/com/faforever/userservice/backend/hydra/HydraService.kt
+++ b/src/main/kotlin/com/faforever/userservice/backend/hydra/HydraService.kt
@@ -143,7 +143,8 @@ class HydraService(
         val roles = listOf("USER") + permissions.map { it.technicalName }
 
         val context = mutableMapOf(
-            "username" to user.username,
+            "username" to user.username, // not official OIDC claim, but required for backwards compatible
+            "preferred_username" to user.username,
             "roles" to roles,
         )