diff --git a/nbdev/test.py b/nbdev/test.py
index 5d727bcc8..9bd9b4164 100644
--- a/nbdev/test.py
+++ b/nbdev/test.py
@@ -86,7 +86,7 @@ def nbdev_test(
 
     if n_workers is None: n_workers = 0 if len(files)==1 else min(num_cpus(), 8)
     if IN_NOTEBOOK: kw = {'method':'spawn'} if os.name=='nt' else {'method':'forkserver'}
-    else: kw = {}
+    else: kw = {'method':'forkserver'} if sys.platform=='darwin' else {}
     wd_pth = get_config().nbs_path
     with working_directory(wd_pth if (wd_pth and wd_pth.exists()) else os.getcwd()):
         results = parallel(test_nb, files, skip_flags=skip_flags, force_flags=force_flags, n_workers=n_workers,
diff --git a/nbs/api/12_test.ipynb b/nbs/api/12_test.ipynb
index 272441871..62b439d48 100644
--- a/nbs/api/12_test.ipynb
+++ b/nbs/api/12_test.ipynb
@@ -180,7 +180,7 @@
     "\n",
     "    if n_workers is None: n_workers = 0 if len(files)==1 else min(num_cpus(), 8)\n",
     "    if IN_NOTEBOOK: kw = {'method':'spawn'} if os.name=='nt' else {'method':'forkserver'}\n",
-    "    else: kw = {}\n",
+    "    else: kw = {'method':'forkserver'} if sys.platform=='darwin' else {}\n",
     "    wd_pth = get_config().nbs_path\n",
     "    with working_directory(wd_pth if (wd_pth and wd_pth.exists()) else os.getcwd()):\n",
     "        results = parallel(test_nb, files, skip_flags=skip_flags, force_flags=force_flags, n_workers=n_workers,\n",
@@ -261,13 +261,7 @@
    "source": []
   }
  ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "python3",
-   "language": "python",
-   "name": "python3"
-  }
- },
+ "metadata": {},
  "nbformat": 4,
  "nbformat_minor": 5
 }