diff --git a/data/actionsmap/yunohost.yml b/data/actionsmap/yunohost.yml
index e20ce5193..0ce254119 100644
--- a/data/actionsmap/yunohost.yml
+++ b/data/actionsmap/yunohost.yml
@@ -527,7 +527,7 @@ app:
                     nargs: "+"
                 -u:
                     full: --users
-                    nargs: "+"
+                    nargs: "*"
 
         ### app_removeaccess() TODO: Write help
         removeaccess:
@@ -541,7 +541,7 @@ app:
                     nargs: "+"
                 -u:
                     full: --users
-                    nargs: "+"
+                    nargs: "*"
 
         ### app_clearaccess()
         clearaccess:
diff --git a/lib/yunohost/app.py b/lib/yunohost/app.py
index 750eea7f1..7b71c20fb 100644
--- a/lib/yunohost/app.py
+++ b/lib/yunohost/app.py
@@ -542,7 +542,7 @@ def app_remove(auth, app):
     msignals.display(m18n.n('app_removed', app), 'success')
 
 
-def app_addaccess(auth, apps, users):
+def app_addaccess(auth, apps, users=[]):
     """
     Grant access right to users (everyone by default)
 
@@ -597,7 +597,7 @@ def app_addaccess(auth, apps, users):
     return { 'allowed_users': new_users.split(',') }
 
 
-def app_removeaccess(auth, apps, users):
+def app_removeaccess(auth, apps, users=[]):
     """
     Revoke access right to users (everyone by default)