diff --git a/src/devices/bluetooth/nm-device-bt.c b/src/devices/bluetooth/nm-device-bt.c
index 10b236c574..e3c623a737 100644
--- a/src/devices/bluetooth/nm-device-bt.c
+++ b/src/devices/bluetooth/nm-device-bt.c
@@ -1194,7 +1194,7 @@ nm_device_bt_class_init (NMDeviceBtClass *klass)
 	g_object_class_install_properties (object_class, _PROPERTY_ENUMS_LAST, obj_properties);
 
 	signals[PPP_STATS] =
-	    g_signal_new ("ppp-stats",
+	    g_signal_new (NM_DEVICE_BT_PPP_STATS,
 	                  G_OBJECT_CLASS_TYPE (object_class),
 	                  G_SIGNAL_RUN_FIRST,
 	                  0, NULL, NULL, NULL,
diff --git a/src/devices/bluetooth/nm-device-bt.h b/src/devices/bluetooth/nm-device-bt.h
index 43bd42576b..9bcf6ca861 100644
--- a/src/devices/bluetooth/nm-device-bt.h
+++ b/src/devices/bluetooth/nm-device-bt.h
@@ -37,6 +37,8 @@
 #define NM_DEVICE_BT_CAPABILITIES "bt-capabilities"
 #define NM_DEVICE_BT_DEVICE       "bt-device"
 
+#define NM_DEVICE_BT_PPP_STATS    "ppp-stats"
+
 typedef struct _NMDeviceBt NMDeviceBt;
 typedef struct _NMDeviceBtClass NMDeviceBtClass;
 
diff --git a/src/devices/wwan/nm-modem.c b/src/devices/wwan/nm-modem.c
index 2b33100ea7..8ee2739416 100644
--- a/src/devices/wwan/nm-modem.c
+++ b/src/devices/wwan/nm-modem.c
@@ -1663,7 +1663,7 @@ nm_modem_class_init (NMModemClass *klass)
 	g_object_class_install_properties (object_class, _PROPERTY_ENUMS_LAST, obj_properties);
 
 	signals[PPP_STATS] =
-	    g_signal_new ("ppp-stats",
+	    g_signal_new (NM_MODEM_PPP_STATS,
 	                  G_OBJECT_CLASS_TYPE (object_class),
 	                  G_SIGNAL_RUN_FIRST,
 	                  0, NULL, NULL, NULL,
@@ -1671,7 +1671,7 @@ nm_modem_class_init (NMModemClass *klass)
 	                  G_TYPE_UINT, G_TYPE_UINT);
 
 	signals[PPP_FAILED] =
-	    g_signal_new ("ppp-failed",
+	    g_signal_new (NM_MODEM_PPP_FAILED,
 	                  G_OBJECT_CLASS_TYPE (object_class),
 	                  G_SIGNAL_RUN_FIRST,
 	                  0, NULL, NULL, NULL,