diff --git a/drivers/include/mtd_default.h b/drivers/include/mtd_default.h
index e8190c2316..fff6376a2e 100644
--- a/drivers/include/mtd_default.h
+++ b/drivers/include/mtd_default.h
@@ -57,6 +57,31 @@ extern "C" {
 
 #endif /*  !defined(MTD_NUMOF) && !DOXYGEN */
 
+#if !DOXYGEN
+
+/**
+ * @brief   Declare `mtd*` according to the number of MTD devices
+ */
+#if MTD_NUMOF > 0
+extern mtd_dev_t *mtd0;
+#endif
+#if MTD_NUMOF > 1
+extern mtd_dev_t *mtd1;
+#endif
+#if MTD_NUMOF > 2
+extern mtd_dev_t *mtd2;
+#endif
+#if MTD_NUMOF > 3
+extern mtd_dev_t *mtd3;
+#endif
+#if MTD_NUMOF > 4
+extern mtd_dev_t *mtd4;
+#endif
+#if MTD_NUMOF > 5
+extern mtd_dev_t *mtd5;
+#endif
+#endif /* !DOXYGEN */
+
 #if defined(MODULE_MTD_SDCARD_DEFAULT)
 extern mtd_sdcard_t mtd_sdcard_dev0;
 #endif
diff --git a/pkg/openthread/contrib/netdev/openthread_netdev.c b/pkg/openthread/contrib/netdev/openthread_netdev.c
index 8bb4270ca0..f3a8ef05fe 100644
--- a/pkg/openthread/contrib/netdev/openthread_netdev.c
+++ b/pkg/openthread/contrib/netdev/openthread_netdev.c
@@ -84,8 +84,8 @@ static void *_openthread_event_loop(void *arg)
 
     event_queue_init(&ev_queue);
 
-    netdev->driver->init(netdev);
     netdev->event_callback = _event_cb;
+    netdev->driver->init(netdev);
 
     netopt_enable_t enable = NETOPT_ENABLE;
     netdev->driver->set(netdev, NETOPT_TX_END_IRQ, &enable, sizeof(enable));