diff --git a/setup.py b/setup.py
index 202d7e0dc..54638edad 100755
--- a/setup.py
+++ b/setup.py
@@ -269,6 +269,7 @@ extras_require['notebook'].extend(extras_require['nbformat'])
 extras_require['nbconvert'].extend(extras_require['nbformat'])
 
 install_requires = [
+    'decorator',
     'path.py', # required by pickleshare, remove when pickleshare is added here
 ]