diff --git a/plugins/mm-modem-mbm.c b/plugins/mm-modem-mbm.c
index 13c5b9ba..b41fc477 100644
--- a/plugins/mm-modem-mbm.c
+++ b/plugins/mm-modem-mbm.c
@@ -290,7 +290,7 @@ get_allowed_mode (MMGenericGsm *gsm,
         return;
     }
 
-    mm_at_serial_port_queue_command (port, "CFUN?", 3, get_allowed_mode_done, info);
+    mm_at_serial_port_queue_command (port, "+CFUN?", 3, get_allowed_mode_done, info);
 }
 
 /*****************************************************************************/