diff --git a/python/run_tests.py b/python/run_tests.py
index 245b7f6..b0a03c9 100755
--- a/python/run_tests.py
+++ b/python/run_tests.py
@@ -24,6 +24,7 @@
 from test import stdlib_unittest
 
 ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+sys.path.append(os.path.join(ROOT_DIR))
 
 
 def main():