diff --git a/coreapi/client.py b/coreapi/client.py
index d02a59c..00b0057 100644
--- a/coreapi/client.py
+++ b/coreapi/client.py
@@ -105,7 +105,7 @@ def __init__(self, decoders=None, transports=None, auth=None, session=None):
         if decoders is None:
             decoders = get_default_decoders()
         if transports is None:
-            transports = get_default_transports(auth=auth)
+            transports = get_default_transports(auth=auth, session=session)
         self._decoders = itypes.List(decoders)
         self._transports = itypes.List(transports)