diff --git a/AWSSDK/Amazon.S3/Model/S3Object.cs b/AWSSDK/Amazon.S3/Model/S3Object.cs
index eb0d0159..49b1a6b5 100644
--- a/AWSSDK/Amazon.S3/Model/S3Object.cs
+++ b/AWSSDK/Amazon.S3/Model/S3Object.cs
@@ -144,7 +144,7 @@ public string LastModified
             {
                 this.lastModified = DateTime.ParseExact(
                     value,
-                    new string[] { AWSSDKUtils.ISO8601DateFormat, AWSSDKUtils.GMTDateFormat },
+                    new string[] { AWSSDKUtils.ISO8601DateFormat, AWSSDKUtils.ISO8601DateFormatNoMS, AWSSDKUtils.GMTDateFormat },
                     CultureInfo.InvariantCulture,
                     DateTimeStyles.None
                     );