diff --git a/nbdev/test.py b/nbdev/test.py
index 103d6ba84..af08cadf5 100644
--- a/nbdev/test.py
+++ b/nbdev/test.py
@@ -32,7 +32,7 @@ def test_nb(fn,  # file name of notebook to test
             verbose=False,  # stream stdout/stderr from cells to console?
             save=False):  # write outputs back to notebook on success?
     "Execute tests in notebook in `fn` except those with `skip_flags`"
-    faulthandler.register(signal.SIGINT, all_threads=True, chain=True)
+    faulthandler.register(signal.SIGINT, file=sys.__stderr__, all_threads=True, chain=True)
     if basepath: sys.path.insert(0, str(basepath))
     if not IN_NOTEBOOK: os.environ["IN_TEST"] = '1'
     flags=set(L(skip_flags)) - set(L(force_flags))
diff --git a/nbs/api/12_test.ipynb b/nbs/api/12_test.ipynb
index 1ce6738f1..7b37da2d2 100644
--- a/nbs/api/12_test.ipynb
+++ b/nbs/api/12_test.ipynb
@@ -62,7 +62,7 @@
     "            verbose=False,  # stream stdout/stderr from cells to console?\n",
     "            save=False):  # write outputs back to notebook on success?\n",
     "    \"Execute tests in notebook in `fn` except those with `skip_flags`\"\n",
-    "    faulthandler.register(signal.SIGINT, all_threads=True, chain=True)\n",
+    "    faulthandler.register(signal.SIGINT, file=sys.__stderr__, all_threads=True, chain=True)\n",
     "    if basepath: sys.path.insert(0, str(basepath))\n",
     "    if not IN_NOTEBOOK: os.environ[\"IN_TEST\"] = '1'\n",
     "    flags=set(L(skip_flags)) - set(L(force_flags))\n",