diff --git a/vpn-daemons/vpnc/src/nm-vpnc-service.c b/vpn-daemons/vpnc/src/nm-vpnc-service.c
index b95173ae2d..29c3f08d58 100644
--- a/vpn-daemons/vpnc/src/nm-vpnc-service.c
+++ b/vpn-daemons/vpnc/src/nm-vpnc-service.c
@@ -1130,10 +1130,11 @@ int main( int argc, char *argv[] )
 
 	vpn_data->loop = g_main_loop_new (NULL, FALSE);
 
-	system ("/sbin/modprobe tun");
+	if (system ("/sbin/modprobe tun") == -1)
+		exit (EXIT_FAILURE);
 
 	if (!(vpn_data->con = nm_vpnc_dbus_init (vpn_data)))
-		exit (1);
+		exit (EXIT_FAILURE);
 
 	action.sa_handler = sigterm_handler;
 	sigemptyset (&block_mask);
@@ -1150,5 +1151,5 @@ int main( int argc, char *argv[] )
 	g_main_loop_unref (vpn_data->loop);
 	g_free (vpn_data);
 
-	exit (0);
+	exit (EXIT_SUCCESS);
 }