diff --git a/LibC/signal.h b/LibC/signal.h
index 2bd8a888df..77ee536512 100644
--- a/LibC/signal.h
+++ b/LibC/signal.h
@@ -32,6 +32,7 @@ int sigdelset(sigset_t*, int sig);
 int sigismember(const sigset_t*, int sig);
 int sigprocmask(int how, const sigset_t* set, sigset_t* old_set);
 int sigpending(sigset_t*);
+int sigsuspend(const sigset_t*);
 int raise(int sig);
 
 extern const char* sys_siglist[NSIG];