diff --git a/HISTORY.rst b/HISTORY.rst
index d214e61ff..324961bc8 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -37,6 +37,8 @@
 - 2231_, [NetBSD]: *available*  `virtual_memory()`_ is higher than *total*.
 - 2234_, [NetBSD]: `virtual_memory()`_ metrics are wrong: *available* and
   *used* are too high. We now match values shown by *htop* CLI utility.
+- 2236_, [NetBSD]: `Process.num_threads()`_ and `Process.threads()`_ return
+  threads that are already terminated.
 
 5.9.4
 =====
diff --git a/psutil/arch/netbsd/proc.c b/psutil/arch/netbsd/proc.c
index b87473a6a..e71afb388 100644
--- a/psutil/arch/netbsd/proc.c
+++ b/psutil/arch/netbsd/proc.c
@@ -247,6 +247,10 @@ psutil_proc_threads(PyObject *self, PyObject *args) {
 
     nlwps = (int)(size / sizeof(struct kinfo_lwp));
     for (i = 0; i < nlwps; i++) {
+        if ((&kl[i])->l_stat == LSIDL || (&kl[i])->l_stat == LSZOMB)
+            continue;
+        // XXX: we return 2 "user" times because the struct does not provide
+        // any "system" time.
         py_tuple = Py_BuildValue("idd",
                                  (&kl[i])->l_lid,
                                  PSUTIL_KPT2DOUBLE((&kl[i])->l_rtime),