diff --git a/Program.cs b/Program.cs
index 9692090..d46533c 100644
--- a/Program.cs
+++ b/Program.cs
@@ -157,6 +157,7 @@ namespace ComicCompressor
             if (DoImage && 
                 filename.ToLower().EndsWith("jpg") ||
                 filename.ToLower().EndsWith("jpeg") ||
+                filename.ToLower().EndsWith("tif") ||
                 filename.ToLower().EndsWith("png"))
             {
                 outputPath = Path.Join(OutputFolder, Path.ChangeExtension(relativePath, "webp"));