diff --git a/manifests/hedgedoc/all.yaml b/manifests/hedgedoc/all.yaml
index fabc571..711dd4d 100644
--- a/manifests/hedgedoc/all.yaml
+++ b/manifests/hedgedoc/all.yaml
@@ -29,7 +29,7 @@ data:
   CMD_OAUTH2_SCOPE: "openid email"
   CMD_OAUTH2_PROVIDERNAME: "t0rt1k Matrix"
   CMD_OAUTH2_USER_PROFILE_ID_ATTR: "sub"
-  CMD_OAUTH2_USER_PROFILE_USERNAME_ATTR: "email"
+  CMD_OAUTH2_USER_PROFILE_USERNAME_ATTR: "sub"
   CMD_OAUTH2_USER_PROFILE_DISPLAY_NAME_ATTR: "email"
   CMD_OAUTH2_USER_PROFILE_EMAIL_ATTR: "email"
 ---