diff --git a/slogging/file_buffer.py b/slogging/file_buffer.py
index 381de7c..a43878d 100644
--- a/slogging/file_buffer.py
+++ b/slogging/file_buffer.py
@@ -1,5 +1,6 @@
 import os
 import collections
+import errno
 from swift.common.utils import lock_file