diff --git a/lob/api_requestor.py b/lob/api_requestor.py
index 2c6b893..6e20eaa 100644
--- a/lob/api_requestor.py
+++ b/lob/api_requestor.py
@@ -6,7 +6,7 @@
 
 class APIRequestor(object):
     def __init__(self, key=None):
-        self.api_key = lob.api_key
+        self.api_key = key or lob.api_key
 
     def parse_response(self, resp):
         payload = json.loads(resp.content)