{
int ret;
if ((unsigned)how - SIG_BLOCK > 2U) return EINVAL;
- ret = -__syscall(SYS_rt_sigprocmask, how, set, old, __SYSCALL_SSLEN);
+ ret = -__syscall(SYS_rt_sigprocmask, how, set, old, _NSIG/8);
if (!ret && old) {
if (sizeof old->__bits[0] == 8) {
old->__bits[0] &= ~0x380000000ULL;