diff --git a/setup.py b/setup.py
index 97ad943f72..372286925d 100644
--- a/setup.py
+++ b/setup.py
@@ -260,9 +260,10 @@ def setup_requirements(requirements_path, module_names, strict_bounds,
     conda_format=conda_build,
 )
 
-conditional_arguments = {
-    'setup_requires' if not conda_build else 'build_requires': setup_requires,
-}
+conditional_arguments = (
+    {'build_requires': setup_requires} if conda_build else {}
+)
+
 
 setup(
     name='zipline',