diff --git a/src/settings/nm-settings-connection.c b/src/settings/nm-settings-connection.c
index 03c46d692a..78d2c9b393 100644
--- a/src/settings/nm-settings-connection.c
+++ b/src/settings/nm-settings-connection.c
@@ -1152,6 +1152,18 @@ get_settings_auth_cb (NMSettingsConnection *self,
 			g_slist_free_full (bssid_list, g_free);
 		}
 
+		/* 802-11-wireless.security property is deprecated. But we set it here so that
+		 * we don't disturb old clients that might expect it being properly set for
+		 * secured Wi-Fi connections.
+		 */
+		if (nm_connection_get_setting_wireless_security (NM_CONNECTION (dupl_con))) {
+			s_wifi = nm_connection_get_setting_wireless (NM_CONNECTION (dupl_con));
+			g_assert (s_wifi);
+			g_object_set (s_wifi,
+			              NM_SETTING_WIRELESS_SEC, NM_SETTING_WIRELESS_SECURITY_SETTING_NAME,
+			              NULL);
+		}
+
 		/* Secrets should *never* be returned by the GetSettings method, they
 		 * get returned by the GetSecrets method which can be better
 		 * protected against leakage of secrets to unprivileged callers.