diff --git a/src/system/linux/signal.c b/src/system/linux/signal.c
index 964c9ea..1edda31 100644
--- a/src/system/linux/signal.c
+++ b/src/system/linux/signal.c
@@ -32,8 +32,7 @@ void msh_linux_setup_signals() {
   sigact.sa_restorer = signal_restorer;
   sigact.sa_flags = SA_RESTORER | SA_RESTART;
 
-  SYSCALL(rt_sigprocmask, SIG_UNBLOCK, &sigact.sa_mask, &sigact.sa_mask,
-          sizeof(sigset_t));
+  SYSCALL(rt_sigprocmask, SIG_UNBLOCK, &sigact.sa_mask, 0, sizeof(sigset_t));
 
   INIT_SIGNAL(SIGINT);
   INIT_SIGNAL(SIGILL);