diff --git a/rtengine/imagedata.cc b/rtengine/imagedata.cc
index 915f723a3..2434fc42b 100644
--- a/rtengine/imagedata.cc
+++ b/rtengine/imagedata.cc
@@ -338,7 +338,10 @@ FramesData::FramesData(const Glib::ustring &fname) :
 
             if (
                 !isHDR
-                && find_exif_tag("Exif.Pentax.Quality")
+                && (
+                    find_exif_tag("Exif.Pentax.Quality")
+                    || find_exif_tag("Exif.PentaxDng.Quality")
+                )
                 && (
                     pos->toLong() == 7
                     || pos->toLong() == 8