diff --git a/__main__.py b/__main__.py
index 55c6e3a..fa9dd47 100644
--- a/tests/static_pdfs/__main__.py
+++ b/tests/static_pdfs/__main__.py
@@ -14,10 +14,11 @@ Part of github.com/pmaupin/static_pdfs.
 
 import sys
 import os
-import collections
 import hashlib
 import static_pdfs
 
+from collections import defaultdict
+
 params = sys.argv[1:]
 
 destroy = params == ['destroy']
@@ -35,7 +36,7 @@ md5.
 ''')
 
 
-found = collections.defaultdict(list)
+found = defaultdict(list)
 
 sys.stdout.write('\n\nReading PDFs:\n\n')