diff --git a/libbmc/fetcher.py b/libbmc/fetcher.py
index 8d90a0b..c477b69 100644
--- a/libbmc/fetcher.py
+++ b/libbmc/fetcher.py
@@ -23,6 +23,8 @@ try:
 except ImportError:
     # Fall back to Python 2's urllib2
     from urllib2 import urlopen, Request
+    class URLError(Exception):
+        pass
 import arxiv2bib as arxiv_metadata
 import libbmc.tools as tools
 import bibtexparser