diff --git a/copy_tests.py b/copy_tests.py
index 631c83117177a9810406e1131eaef7fe204efabe..f6c33a4cc22f93b5730004a829401f89ad720feb 100644
--- a/copy_tests.py
+++ b/copy_tests.py
@@ -1,9 +1,10 @@
 import os
-from shutil import copytree
+from shutil import copytree, rmtree
 import site 
 
 
 def copy_directory(src, dest, directory):
+    rmtree(os.path.join(dest, directory))
     copytree(os.path.join(src, directory), os.path.join(dest, directory))