diff --git a/test/test_swfinterp.py b/test/test_swfinterp.py
index 3bb5a6308..b42cd74c7 100644
--- a/test/test_swfinterp.py
+++ b/test/test_swfinterp.py
@@ -7,6 +7,7 @@ import unittest
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 
+import errno
 import io
 import json
 import re