diff --git a/app/api/views/new_custom_alias.py b/app/api/views/new_custom_alias.py
index 86b2919a..767020f5 100644
--- a/app/api/views/new_custom_alias.py
+++ b/app/api/views/new_custom_alias.py
@@ -3,7 +3,7 @@ from flask import jsonify, request
 from flask_cors import cross_origin
 
 from app.api.base import api_bp, verify_api_key
-from app.config import EMAIL_DOMAIN
+from app.config import EMAIL_DOMAIN, MAX_NB_EMAIL_FREE_PLAN
 from app.extensions import db
 from app.log import LOG
 from app.models import GenEmail, AliasUsedOn
@@ -31,7 +31,7 @@ def new_custom_alias():
         return (
             jsonify(
                 error="You have reached the limitation of a free account with the maximum of "
-                "3 custom aliases, please upgrade your plan to create more custom aliases"
+                f"{MAX_NB_EMAIL_FREE_PLAN} aliases, please upgrade your plan to create more aliases"
             ),
             400,
         )
diff --git a/tests/api/test_new_custom_alias.py b/tests/api/test_new_custom_alias.py
index 35ae512c..4dabd645 100644
--- a/tests/api/test_new_custom_alias.py
+++ b/tests/api/test_new_custom_alias.py
@@ -48,5 +48,5 @@ def test_out_of_quota(flask_client):
 
     assert r.status_code == 400
     assert r.json == {
-        "error": "You have reached the limitation of a free account with the maximum of 3 custom aliases, please upgrade your plan to create more custom aliases"
+        "error": "You have reached the limitation of a free account with the maximum of 3 aliases, please upgrade your plan to create more aliases"
     }