diff --git a/src/Renci.SshNet/SftpClient.cs b/src/Renci.SshNet/SftpClient.cs
index 85a9d9fb1..ec30f8958 100644
--- a/src/Renci.SshNet/SftpClient.cs
+++ b/src/Renci.SshNet/SftpClient.cs
@@ -1681,10 +1681,11 @@ private IEnumerable<FileInfo> InternalSynchronizeDirectories(string sourcePath,
 
                 if (!isDifferent)
                 {
-                    var temp = destDict[localFile.Name];
+                    var dest = destDict[localFile.Name];
                     //  TODO:   Use md5 to detect a difference
-                    //ltang: File exists at the destination => Using filesize to detect the difference
-                    isDifferent = localFile.Length != temp.Length;
+                    // ltang: File exists at the destination => Using filesize to detect the difference
+                    // and the LastWriteTime (with a window of 60s to avoid clock differences between machines)
+                    isDifferent = (localFile.Length != dest.Length) || (dest.LastWriteTimeUtc.AddSeconds(-60.0)  <= localFile.LastWriteTimeUtc);
                 }
 
                 if (isDifferent)