diff --git a/src/nm-device-modem.c b/src/nm-device-modem.c
index 3ba26ddcd..441f92cec 100644
--- a/src/nm-device-modem.c
+++ b/src/nm-device-modem.c
@@ -46,6 +46,7 @@ enum {
 
 enum {
 	PPP_STATS,
+	ENABLE_CHANGED,
 	LAST_SIGNAL
 };
 static guint signals[LAST_SIGNAL] = { 0 };
@@ -158,6 +159,8 @@ modem_enabled_cb (NMModem *modem, GParamSpec *pspec, gpointer user_data)
 	NMDeviceModemPrivate *priv = NM_DEVICE_MODEM_GET_PRIVATE (self);
 
 	real_set_enabled (NM_DEVICE_INTERFACE (self), nm_modem_get_mm_enabled (priv->modem));
+
+	g_signal_emit (G_OBJECT (self), signals[ENABLE_CHANGED], 0);
 }
 
 /*****************************************************************************/
@@ -453,6 +456,15 @@ nm_device_modem_class_init (NMDeviceModemClass *mclass)
 					  G_TYPE_NONE, 2,
 					  G_TYPE_UINT, G_TYPE_UINT);
 
+	signals[ENABLE_CHANGED] =
+		g_signal_new (NM_DEVICE_MODEM_ENABLE_CHANGED,
+					  G_OBJECT_CLASS_TYPE (object_class),
+					  G_SIGNAL_RUN_FIRST,
+					  0,
+					  NULL, NULL,
+					  g_cclosure_marshal_VOID__VOID,
+					  G_TYPE_NONE, 0);
+
 	dbus_g_object_type_install_info (G_TYPE_FROM_CLASS (mclass),
 	                                 nm_modem_get_serial_dbus_info ());
 }
diff --git a/src/nm-device-modem.h b/src/nm-device-modem.h
index 40e89d4b7..c6ef4d218 100644
--- a/src/nm-device-modem.h
+++ b/src/nm-device-modem.h
@@ -36,6 +36,8 @@
 
 #define NM_DEVICE_MODEM_MODEM "modem"
 
+#define NM_DEVICE_MODEM_ENABLE_CHANGED "enable-changed"
+
 typedef struct {
 	NMDevice parent;
 } NMDeviceModem;
diff --git a/src/nm-manager.c b/src/nm-manager.c
index 965556728..1bc9e5a46 100644
--- a/src/nm-manager.c
+++ b/src/nm-manager.c
@@ -1459,9 +1459,7 @@ manager_ipw_rfkill_state_changed (NMDeviceWifi *device,
 }
 
 static void
-manager_modem_enabled_changed (NMModem *device,
-                               GParamSpec *pspec,
-                               gpointer user_data)
+manager_modem_enabled_changed (NMModem *device, gpointer user_data)
 {
 	nm_manager_rfkill_update (NM_MANAGER (user_data), RFKILL_TYPE_WWAN);
 }
@@ -1515,7 +1513,7 @@ add_device (NMManager *self, NMDevice *device)
 		nm_device_interface_set_enabled (NM_DEVICE_INTERFACE (device),
 		                                 priv->radio_states[RFKILL_TYPE_WLAN].enabled);
 	} else if (NM_IS_DEVICE_MODEM (device)) {
-		g_signal_connect (device, "notify::" NM_MODEM_ENABLED,
+		g_signal_connect (device, NM_DEVICE_MODEM_ENABLE_CHANGED,
 		                  G_CALLBACK (manager_modem_enabled_changed),
 		                  self);