diff --git a/_unittests/ut_helpgen/test_notebooks.py b/_unittests/ut_helpgen/test_notebooks.py
index bbcc31843..5b4de54c6 100644
--- a/_unittests/ut_helpgen/test_notebooks.py
+++ b/_unittests/ut_helpgen/test_notebooks.py
@@ -23,6 +23,7 @@
 
 from src.pyquickhelper.loghelper.flog import fLOG, run_cmd
 from src.pyquickhelper.helpgen.sphinx_main import process_notebooks, add_notebook_page
+from src.pyquickhelper import get_temp_folder
 
 if sys.version_info[0] == 2:
     from codecs import open
@@ -50,12 +51,8 @@ def test_notebook(self):
         nb = os.path.join(fold, "example_pyquickhelper.ipynb")
         assert os.path.exists(nb)
 
-        temp = os.path.join(path, "temp_nb")
-        if not os.path.exists(temp):
-            os.mkdir(temp)
-        for file in os.listdir(temp):
-            os.remove(os.path.join(temp, file))
-
+        temp = get_temp_folder(__file__, "temp_nb")
+        
         if sys.platform.startswith("win"):
             p1 = r"C:\Program Files\MiKTeX 2.9\miktex\bin\x64"
             p2 = r"%USERPROFILE%\AppData\Local\Pandoc"
diff --git a/src/pyquickhelper/helpgen/process_notebooks.py b/src/pyquickhelper/helpgen/process_notebooks.py
index 597806afd..fe5ab12e6 100644
--- a/src/pyquickhelper/helpgen/process_notebooks.py
+++ b/src/pyquickhelper/helpgen/process_notebooks.py
@@ -167,9 +167,6 @@ def process_notebooks(notebooks,
         if not os.path.exists(build_slide):
             os.mkdir(build_slide)
 
-        # for some reason, sometimes, the folder is not in write mode
-        change_file_status(build_slide)
-
     if "WinPython" in sys.executable:
         # pip, or any program in Scripts cannot find python.exe
         # for the distribution WinPython
diff --git a/src/pyquickhelper/pycode/utils_tests.py b/src/pyquickhelper/pycode/utils_tests.py
index 924ba5f61..b3e28ef2e 100644
--- a/src/pyquickhelper/pycode/utils_tests.py
+++ b/src/pyquickhelper/pycode/utils_tests.py
@@ -8,6 +8,7 @@
 from __future__ import print_function
 
 import os
+import stat
 import sys
 import glob
 import re
@@ -48,12 +49,20 @@ def get_temp_folder(thisfile, name, clean=True, create=True):
     if not os.path.exists(local):
         if create:
             os.mkdir(local)
+            mode = os.stat(local).st_mode
+            nmode = mode | stat.S_IWRITE
+            if nmode != mode:
+                os.chmod(local, nmode)
     else:
         if clean:
             remove_folder(local)
             time.sleep(0.1)
         if create and not os.path.exists(local):
             os.mkdir(local)
+            mode = os.stat(local).st_mode
+            nmode = mode | stat.S_IWRITE
+            if nmode != mode:
+                os.chmod(local, nmode)
 
     return local