diff --git a/pulp/apis/core.py b/pulp/apis/core.py
index 23570e45..3dcc68be 100644
--- a/pulp/apis/core.py
+++ b/pulp/apis/core.py
@@ -163,7 +163,6 @@ def initialize(filename, operating_system="linux", arch="64"):
     PULPCFGFILE += ".win"
 elif sys.platform in ["darwin"]:
     operating_system = "osx"
-    arch = "64"
     PULPCFGFILE += ".osx"
 else:
     operating_system = "linux"