diff --git a/rtengine/imageio.cc b/rtengine/imageio.cc
index d195440fb..943826288 100644
--- a/rtengine/imageio.cc
+++ b/rtengine/imageio.cc
@@ -819,7 +819,7 @@ int ImageIO::saveTIFF (Glib::ustring fname, int bps, bool uncompressed) {
 	
         }
 				
-        TIFFSetField (out, TIFFTAG_SOFTWARE, "RawTherapee 3");
+        TIFFSetField (out, TIFFTAG_SOFTWARE, "RawTherapee 4");
         TIFFSetField (out, TIFFTAG_IMAGEWIDTH, width);
         TIFFSetField (out, TIFFTAG_IMAGELENGTH, height);
         TIFFSetField (out, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);