diff --git a/dev/buildbot/master/master.cfg b/dev/buildbot/master/master.cfg
index da6c7d63..e8c4f550 100644
--- a/dev/buildbot/master/master.cfg
+++ b/dev/buildbot/master/master.cfg
@@ -194,7 +194,7 @@ BuilderConfig(name="Javascript-linux",
 c['builders'].append(
     BuilderConfig(name="Python-sdist",
                   slavenames=["OSX-slave"],
-                  factory = python_slave("PYPI", platform = 'OSX')
+                  factory = python_slave("PYPI", platform = 'OSX', conda_env = 'py27')
                   )
       )