diff --git a/openstack/common/timeutils.py b/openstack/common/timeutils.py
index 52688a02..386534ba 100644
--- a/openstack/common/timeutils.py
+++ b/openstack/common/timeutils.py
@@ -114,7 +114,7 @@ def utcnow():
 
 
 def iso8601_from_timestamp(timestamp):
-    """Returns a iso8601 formatted date from timestamp."""
+    """Returns an iso8601 formatted date from timestamp."""
     return isotime(datetime.datetime.utcfromtimestamp(timestamp))