int protocol_port; /* babel's port */
int protocol_socket = -1; /* socket: communicate with others babeld */
-static char babel_config_default[] = SYSCONFDIR BABEL_DEFAULT_CONFIG;
+static const char babel_config_default[] = SYSCONFDIR BABEL_DEFAULT_CONFIG;
static char *babel_vty_addr = NULL;
static int babel_vty_port = BABEL_VTY_PORT;