diff --git a/tests/all_tests.py b/tests/all_tests.py
index b6693c6..2222f85 100755
--- a/tests/all_tests.py
+++ b/tests/all_tests.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 
 import sys
-sys.path.extend(['.', '..'])
+sys.path[0:0] = ['.', '..']
 
 import unittest