diff --git a/python/tidy/setup.py b/python/tidy/setup.py
index f3525a3c07d..958e5dd55c5 100644
--- a/python/tidy/setup.py
+++ b/python/tidy/setup.py
@@ -15,6 +15,7 @@ VERSION = '0.0.1'
 
 install_requires = [
     "flake8==2.4.1",
+    "toml==0.9.1",
 ]
 
 here = os.path.dirname(os.path.abspath(__file__))