diff --git a/IPython/html/nbconvert/handlers.py b/IPython/html/nbconvert/handlers.py
index b2317ee..ae83344 100644
--- a/IPython/html/nbconvert/handlers.py
+++ b/IPython/html/nbconvert/handlers.py
@@ -6,7 +6,6 @@
 import io
 import os
 import zipfile
-import collections
 
 from tornado import web