diff --git a/Utilities/bootstrap b/Utilities/bootstrap
index d891da55691..e87e21faed6 100755
--- a/Utilities/bootstrap
+++ b/Utilities/bootstrap
@@ -592,7 +592,8 @@ def install_file(args, src, destination, destination_is_directory=True, ignored_
 
     logging.info("Installing %s to %s", src, dest)
     if os.path.isdir(src):
-        shutil.copytree(src, dest, ignore=shutil.ignore_patterns(*ignored_patterns), dirs_exist_ok=True)
+        additional_kwargs = { "dirs_exist_ok": True } if sys.version_info.major >=3 and sys.version_info.minor >= 8 else {}
+        shutil.copytree(src, dest, ignore=shutil.ignore_patterns(*ignored_patterns), **additional_kwargs)
     else:
         shutil.copy2(src, dest)