diff --git a/xorriso/emulators.c b/xorriso/emulators.c
index d443af10..8cb2d606 100644
--- a/xorriso/emulators.c
+++ b/xorriso/emulators.c
@@ -2363,7 +2363,7 @@ problem_handler_2:;
      if(ret <= 0)
        goto problem_handler_boot;
    } else if(strcmp(argpt, "-isohybrid-gpt-basdat") == 0) {
-     xorriso->patch_isolinux_image = (xorriso->patch_isolinux_image & ~0x1fc) |
+     xorriso->patch_isolinux_image = (xorriso->patch_isolinux_image & ~0x0fc) |
                                      (1 << 2);
    } else if(strcmp(argpt, "-isohybrid-gpt-hfsplus") == 0) {
      xorriso->patch_isolinux_image = (xorriso->patch_isolinux_image & ~0x0fc) |
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index 0a80997a..e06ba3b8 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2014.09.23.064554"
+#define Xorriso_timestamP "2014.09.28.085819"