diff --git a/backports/datetime_timestamp/__init__.py b/backports/datetime_timestamp/__init__.py
index <HASH>..<HASH> 100644
--- a/backports/datetime_timestamp/__init__.py
+++ b/backports/datetime_timestamp/__init__.py
@@ -27,6 +27,9 @@ def timestamp(dt):
 
 	>>> timestamp(datetime.datetime.now()) > 1494638812
 	True
+
+	>>> timestamp(datetime.datetime.now()) % 1 > 0
+	True
 	"""
 	if dt.tzinfo is None:
 		return time.mktime((
Add test ensuring that fractional seconds are present on naive datetimes.