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Diffstat (limited to 'src/thread/pthread_sigmask.c')
-rw-r--r--src/thread/pthread_sigmask.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/thread/pthread_sigmask.c b/src/thread/pthread_sigmask.c
index 88c333f6..f188782a 100644
--- a/src/thread/pthread_sigmask.c
+++ b/src/thread/pthread_sigmask.c
@@ -5,7 +5,7 @@
int pthread_sigmask(int how, const sigset_t *restrict set, sigset_t *restrict old)
{
int ret;
- if ((unsigned)how - SIG_BLOCK > 2U) return EINVAL;
+ if (set && (unsigned)how - SIG_BLOCK > 2U) return EINVAL;
ret = -__syscall(SYS_rt_sigprocmask, how, set, old, _NSIG/8);
if (!ret && old) {
if (sizeof old->__bits[0] == 8) {