diff --git a/src/yunohost/user.py b/src/yunohost/user.py
index a1e8b1459..282ec8407 100644
--- a/src/yunohost/user.py
+++ b/src/yunohost/user.py
@@ -170,7 +170,8 @@ def user_create(operation_logger, username, firstname, lastname, mail, password,
 
     uid_guid_found = False
     while not uid_guid_found:
-        uid = str(random.randint(200, 99999))
+        # LXC uid number is limited to 65536 by default
+        uid = str(random.randint(200, 65000))
         uid_guid_found = uid not in all_uid and uid not in all_gid
 
     # Adapt values for LDAP
@@ -201,8 +202,9 @@ def user_create(operation_logger, username, firstname, lastname, mail, password,
     except Exception as e:
         raise YunohostError('user_creation_failed', user=username, error=e)
 
-    # Invalidate passwd to take user creation into account
+    # Invalidate passwd and group to take user and group creation into account
     subprocess.call(['nscd', '-i', 'passwd'])
+    subprocess.call(['nscd', '-i', 'group'])
 
     try:
         # Attempt to create user home folder