diff --git a/plugins/modem-manager/fu-mm-device.c b/plugins/modem-manager/fu-mm-device.c
index d1491b101..17feaf003 100644
--- a/plugins/modem-manager/fu-mm-device.c
+++ b/plugins/modem-manager/fu-mm-device.c
@@ -1520,6 +1520,7 @@ fu_mm_device_init(FuMmDevice *self)
 {
 	fu_device_add_flag(FU_DEVICE(self), FWUPD_DEVICE_FLAG_UPDATABLE);
 	fu_device_add_flag(FU_DEVICE(self), FWUPD_DEVICE_FLAG_USE_RUNTIME_VERSION);
+	fu_device_add_flag(FU_DEVICE(self), FWUPD_DEVICE_FLAG_REQUIRE_AC);
 	fu_device_add_internal_flag(FU_DEVICE(self), FU_DEVICE_INTERNAL_FLAG_REPLUG_MATCH_GUID);
 	fu_device_set_version_format(FU_DEVICE(self), FWUPD_VERSION_FORMAT_PLAIN);
 	fu_device_set_summary(FU_DEVICE(self), "Mobile broadband device");