diff --git a/src/devices/nm-device.c b/src/devices/nm-device.c
index 1a9a8a3745..62d2e57836 100644
--- a/src/devices/nm-device.c
+++ b/src/devices/nm-device.c
@@ -11354,6 +11354,9 @@ check_and_reapply_connection (NMDevice *self,
 	s_ip6_old = nm_connection_get_setting_ip6_config (con_old);
 	s_ip6_new = nm_connection_get_setting_ip6_config (con_new);
 
+	/* Allow reapply of MTU */
+	priv->mtu_source = NM_DEVICE_MTU_SOURCE_NONE;
+
 	nm_device_reactivate_ip4_config (self, s_ip4_old, s_ip4_new);
 	nm_device_reactivate_ip6_config (self, s_ip6_old, s_ip6_new);