diff --git a/plugins/ata/fu-ata-device.c b/plugins/ata/fu-ata-device.c
index b8600636f..1e1c0aa7f 100644
--- a/plugins/ata/fu-ata-device.c
+++ b/plugins/ata/fu-ata-device.c
@@ -136,9 +136,9 @@ fu_ata_device_pad_string_for_id(const gchar *name)
 static gchar *
 fu_ata_device_get_guid_safe(const guint16 *buf, guint16 addr_start)
 {
-	if (!fu_common_guid_is_plausible((guint8 *)(buf + addr_start)))
+	if (!fu_common_guid_is_plausible((((guint8 *)buf) + addr_start)))
 		return NULL;
-	return fwupd_guid_to_string((const fwupd_guid_t *)(buf + addr_start),
+	return fwupd_guid_to_string((const fwupd_guid_t *)(((guint8 *)buf) + addr_start),
 				    FWUPD_GUID_FLAG_MIXED_ENDIAN);
 }
 
diff --git a/plugins/dell-dock/fu-dell-dock-i2c-mst.c b/plugins/dell-dock/fu-dell-dock-i2c-mst.c
index 811124465..7345ca4c0 100644
--- a/plugins/dell-dock/fu-dell-dock-i2c-mst.c
+++ b/plugins/dell-dock/fu-dell-dock-i2c-mst.c
@@ -1246,7 +1246,6 @@ fu_dell_dock_mst_class_init(FuDellDockMstClass *klass)
 	klass_device->open = fu_dell_dock_mst_open;
 	klass_device->close = fu_dell_dock_mst_close;
 	klass_device->setup = fu_dell_dock_mst_setup;
-	klass_device->probe = fu_dell_dock_mst_probe;
 	klass_device->write_firmware = fu_dell_dock_mst_write_fw;
 	klass_device->set_quirk_kv = fu_dell_dock_mst_set_quirk_kv;
 	klass_device->set_progress = fu_dell_dock_mst_set_progress;