diff --git a/psutil/_psosx.py b/psutil/_psosx.py
index b86cfb343..a69f892c6 100644
--- a/psutil/_psosx.py
+++ b/psutil/_psosx.py
@@ -518,7 +518,8 @@ def status(self):
 
     @wrap_exceptions
     def threads(self):
-        rawlist = cext.proc_threads(self.pid)
+        with catch_zombie(self):
+            rawlist = cext.proc_threads(self.pid)
         retlist = []
         for thread_id, utime, stime in rawlist:
             ntuple = _common.pthread(thread_id, utime, stime)
diff --git a/psutil/_psutil_osx.c b/psutil/_psutil_osx.c
index 2ec51eeda..92d48dd4d 100644
--- a/psutil/_psutil_osx.c
+++ b/psutil/_psutil_osx.c
@@ -1006,10 +1006,7 @@ psutil_proc_threads(PyObject *self, PyObject *args) {
     // task_for_pid() requires special privileges
     err = task_for_pid(mach_task_self(), (pid_t)pid, &task);
     if (err != KERN_SUCCESS) {
-        if (psutil_pid_exists(pid) == 0)
-            NoSuchProcess();
-        else
-            AccessDenied();
+        psutil_raise_for_pid(pid, "task_for_pid() failed");
         goto error;
     }