diff --git a/plug-ins/common/file-heif.c b/plug-ins/common/file-heif.c
index 952a1ffa57..8f9bae49af 100644
--- a/plug-ins/common/file-heif.c
+++ b/plug-ins/common/file-heif.c
@@ -121,9 +121,7 @@ query (void)
   gimp_register_file_handler_mime (LOAD_PROC, "image/heif");
   gimp_register_file_handler_uri (LOAD_PROC);
   /* HEIF is an ISOBMFF format whose "brand" (the value after "ftyp")
-   * can be of various values. I added the "mif1" brand as I saw some
-   * HEIF files with this value, and it loaded fine (though it may not
-   * be valid theoretically, according to libheif developers).
+   * can be of various values.
    * See also: https://gitlab.gnome.org/GNOME/gimp/issues/2209
    */
   gimp_register_magic_load_handler (LOAD_PROC,
@@ -132,7 +130,8 @@ query (void)
                                     "4,string,ftypheic,4,string,ftypheix,"
                                     "4,string,ftyphevc,4,string,ftypheim,"
                                     "4,string,ftypheis,4,string,ftyphevm,"
-                                    "4,string,ftyphevs,4,string,ftypmif1");
+                                    "4,string,ftyphevs,4,string,ftypmif1,"
+                                    "4,string,ftypmsf1");
 
   gimp_install_procedure (SAVE_PROC,
                           _("Exports HEIF images"),