diff --git a/src/yunohost/app.py b/src/yunohost/app.py
index 0263a9d98..a19871699 100644
--- a/src/yunohost/app.py
+++ b/src/yunohost/app.py
@@ -717,7 +717,7 @@ def app_install(operation_logger, app, label=None, args=None, no_remove_on_failu
 
     # Initialize the main permission for the app
     # After the install, if apps don't have a domain and path defined, the default url '/' is removed from the permission
-    permission_create(app_instance_name+".main", url="/", allowed=["all_users"], label=label, show_tile=True, protected=False)
+    permission_create(app_instance_name+".main", allowed=["all_users"], label=label, show_tile=True, protected=False)
 
     # Execute the app install script
     install_failed = True
@@ -830,12 +830,12 @@ def app_install(operation_logger, app, label=None, args=None, no_remove_on_failu
     os.system('chown -R root: %s' % app_setting_path)
     os.system('chown -R admin: %s/scripts' % app_setting_path)
 
-    # If an app doesn't have at least a domain and a path, assume it's not a webapp and remove the default "/" permission
+    # If the app haven't set the url of the main permission and domain and path is set set / as main url
     app_settings = _get_app_settings(app_instance_name)
     domain = app_settings.get('domain', None)
     path = app_settings.get('path', None)
-    if not (domain and path):
-        permission_url(app_instance_name + ".main", url=None, sync_perm=False)
+    if domain and path and user_permission_list(full=True, full_path=False)['permissions'][app_instance_name + '.main']['url'] is None:
+        permission_url(app_instance_name + ".main", url='/', sync_perm=False)
 
     _migrate_legacy_permissions(app_instance_name)