--- a/sklearn/_build_utils/pre_build_helpers.py
+++ b/sklearn/_build_utils/pre_build_helpers.py
@@ -3,6 +3,7 @@
 import os
 import sys
 import glob
+import time
 import tempfile
 import textwrap
 import setuptools  # noqa
@@ -93,6 +93,7 @@
             raise
         finally:
             os.chdir(start_dir)
+            time.sleep(2)
 
     return output