diff --git a/colander/iso8601.py b/colander/iso8601.py
index 2f7deaa..f608c11 100644
--- a/colander/iso8601.py
+++ b/colander/iso8601.py
@@ -1,5 +1,5 @@
 from __future__ import absolute_import
 import iso8601
-from iso8601.iso8601 import (parse_date, ParseError, Utc, FixedOffset, UTC, ZERO)
+from iso8601.iso8601 import (parse_date, ParseError, Utc, FixedOffset, UTC, ZERO, ISO8601_REGEX)
 
 __all__ = ["parse_date", "ParseError", "Utc", "FixedOffset"]