diff --git a/Duplicati/Library/Main/Operation/FilelistProcessor.cs b/Duplicati/Library/Main/Operation/FilelistProcessor.cs
index bf7756021..88544f4c4 100644
--- a/Duplicati/Library/Main/Operation/FilelistProcessor.cs
+++ b/Duplicati/Library/Main/Operation/FilelistProcessor.cs
@@ -214,9 +214,9 @@ namespace Duplicati.Library.Main.Operation
                                      select n).ToList();
 
             log.KnownFileCount = remotelist.Count();
-            log.KnownFileSize = remotelist.Select(x => x.File.Size).Sum();
+            log.KnownFileSize = remotelist.Select(x => Math.Max(0, x.File.Size)).Sum();
             log.UnknownFileCount = unknownlist.Count();
-            log.UnknownFileSize = unknownlist.Select(x => x.Size).Sum();
+            log.UnknownFileSize = unknownlist.Select(x => Math.Max(0, x.Size)).Sum();
             log.BackupListCount = filesets.Count;
             log.LastBackupDate = filesets.Count == 0 ? new DateTime(0) : filesets[0].Time.ToLocalTime();