diff --git a/requests/sessions.py b/requests/sessions.py
index 520b4b3c..061983bf 100644
--- a/requests/sessions.py
+++ b/requests/sessions.py
@@ -13,7 +13,7 @@ import os
 from .compat import cookielib
 from .cookies import cookiejar_from_dict
 from .models import Request
-from .hooks import default_hooks
+from .hooks import default_hooks, dispatch_hook
 from .utils import from_key_val_list, default_headers
 from .exceptions import TooManyRedirects, InvalidSchema