diff --git a/xorriso/write_run.c b/xorriso/write_run.c
index c8aef643..1b1b9aff 100644
--- a/xorriso/write_run.c
+++ b/xorriso/write_run.c
@@ -478,7 +478,8 @@ int Xorriso_set_system_area(struct XorrisO *xorriso, struct burn_drive *drive,
        system_area_options= 0;
      } else if(xorriso->patch_system_area & 2) { /* isohybrid patching */
        /* Check whether bytes 432-345 point to ElTorito LBA */
-       hd_lba= ub[432] | (ub[433] << 8) | (ub[434] << 16) | (ub[435] << 24);
+       hd_lba= ub[432] | (ub[433] << 8) | (ub[434] << 16) |
+               (((unsigned int) ub[435]) << 24);
        ret= iso_image_get_boot_image(img, &bootimg, &bootimg_node, NULL);
        if(ret != 1) {
          system_area_options= 0;
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index 21d5fc4a..29402ac6 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2015.11.16.100618"
+#define Xorriso_timestamP "2015.11.16.102246"