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-rw-r--r--src/signal/sigprocmask.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/signal/sigprocmask.c b/src/signal/sigprocmask.c
index db27f12a..1bc5baa6 100644
--- a/src/signal/sigprocmask.c
+++ b/src/signal/sigprocmask.c
@@ -12,7 +12,7 @@ int __sigprocmask(int how, const sigset_t *set, sigset_t *old)
 {
 	sigset_t tmp;
 	/* Disallow blocking thread control signals */
-	if (how != SIG_UNBLOCK) {
+	if (set && how != SIG_UNBLOCK) {
 		tmp = *set;
 		set = &tmp;
 		sigdelset(&tmp, SIGCANCEL);