diff --git a/src/nm-device-802-11-wireless.c b/src/nm-device-802-11-wireless.c
index 1063270aa5..fb688bf630 100644
--- a/src/nm-device-802-11-wireless.c
+++ b/src/nm-device-802-11-wireless.c
@@ -201,7 +201,7 @@ nm_device_802_11_wireless_update_bssid (NMDevice80211Wireless *self)
  * current access point.
  *
  */
-void
+static void
 nm_device_802_11_wireless_update_signal_strength (NMDevice80211Wireless *self)
 {
 	NMData *		app_data;