diff --git a/lib/std/os/bits/darwin.zig b/lib/std/os/bits/darwin.zig
index a6dbff8453..8bd40ed9a3 100644
--- a/lib/std/os/bits/darwin.zig
+++ b/lib/std/os/bits/darwin.zig
@@ -126,6 +126,11 @@ pub const timespec = extern struct {
 pub const sigset_t = u32;
 pub const empty_sigset: sigset_t = 0;
 
+pub const SIG_ERR = @intToPtr(?Sigaction.sigaction_fn, maxInt(usize));
+pub const SIG_DFL = @intToPtr(?Sigaction.sigaction_fn, 0);
+pub const SIG_IGN = @intToPtr(?Sigaction.sigaction_fn, 1);
+pub const SIG_HOLD = @intToPtr(?Sigaction.sigaction_fn, 5);
+
 pub const siginfo_t = extern struct {
     signo: c_int,
     errno: c_int,
diff --git a/lib/std/os/test.zig b/lib/std/os/test.zig
index bbc6c968f1..59116e1bbd 100644
--- a/lib/std/os/test.zig
+++ b/lib/std/os/test.zig
@@ -672,8 +672,11 @@ test "sigaction" {
     // Check that we can read it back correctly.
     os.sigaction(os.SIGUSR1, null, &old_sa);
     testing.expectEqual(S.handler, old_sa.handler.sigaction.?);
-    testing.expect((old_sa.flags & os.SA_RESETHAND) != 0);
+    testing.expect((old_sa.flags & os.SA_SIGINFO) != 0);
     // Invoke the handler.
     try os.raise(os.SIGUSR1);
     testing.expect(signal_test_failed == false);
+    // Check if the handler has been correctly reset to SIG_DFL
+    os.sigaction(os.SIGUSR1, null, &old_sa);
+    testing.expectEqual(os.SIG_DFL, old_sa.handler.sigaction);
 }