diff --git a/src/devices/nm-device.c b/src/devices/nm-device.c
index e3e64787f8..808ba6f0b1 100644
--- a/src/devices/nm-device.c
+++ b/src/devices/nm-device.c
@@ -4079,6 +4079,14 @@ print_support_extended_ifa_flags (NMSettingIP6ConfigPrivacy use_tempaddr)
 	warn = 2;
 }
 
+static void
+nm_device_set_mtu (NMDevice *self, guint32 mtu)
+{
+        /* MTU */
+        if (mtu && mtu != nm_platform_link_get_mtu (ifindex))
+                nm_platform_link_set_mtu (ifindex, mtu);
+}
+
 static void
 nm_device_ipv6_set_mtu (NMDevice *self, guint32 mtu)
 {
@@ -5928,6 +5936,8 @@ nm_device_set_ip4_config (NMDevice *self,
 	if (commit && new_config) {
 		gboolean assumed = nm_device_uses_assumed_connection (self);
 
+		nm_device_set_mtu (self, nm_ip4_config_get_mtu (new_config));
+
 		/* for assumed devices we set the device_route_metric to the default which will
 		 * stop nm_platform_ip4_address_sync() to replace the device routes. */
 		success = nm_ip4_config_commit (new_config, ip_ifindex,
diff --git a/src/nm-ip4-config.c b/src/nm-ip4-config.c
index 1f3e5954b3..10e2b62c62 100644
--- a/src/nm-ip4-config.c
+++ b/src/nm-ip4-config.c
@@ -264,7 +264,6 @@ gboolean
 nm_ip4_config_commit (const NMIP4Config *config, int ifindex, guint32 default_route_metric)
 {
 	NMIP4ConfigPrivate *priv = NM_IP4_CONFIG_GET_PRIVATE (config);
-	guint32 mtu = nm_ip4_config_get_mtu (config);
 	int i;
 
 	g_return_val_if_fail (ifindex > 0, FALSE);
@@ -299,10 +298,6 @@ nm_ip4_config_commit (const NMIP4Config *config, int ifindex, guint32 default_ro
 			return FALSE;
 	}
 
-	/* MTU */
-	if (mtu && mtu != nm_platform_link_get_mtu (ifindex))
-		nm_platform_link_set_mtu (ifindex, mtu);
-
 	return TRUE;
 }