--- a/sklearn/_build_utils/pre_build_helpers.py
+++ b/sklearn/_build_utils/pre_build_helpers.py
@@ -6,6 +6,7 @@
 import sys
 import tempfile
 import textwrap
+import time
 
 from setuptools.command.build_ext import customize_compiler, new_compiler
 
@@ -54,6 +54,7 @@
             raise
         finally:
             os.chdir(start_dir)
+            time.sleep(2)
 
     return output