diff --git a/linux/build/scripts/build-inner.sh b/linux/build/scripts/build-inner.sh
index 820f244..10763fc 100755
--- a/linux/build/scripts/build-inner.sh
+++ b/linux/build/scripts/build-inner.sh
@@ -185,10 +185,24 @@ post_process_for_reproducibility() {
     # rewrites just the named file then re-emits the ISO; -boot_image
     # any keep preserves the existing El Torito + GPT/UEFI bits so the
     # image stays bootable.
+    #
+    # -return_with SORRY 0: by default xorriso exits 32 when it raises
+    # a SORRY-severity diagnostic, even when the write itself succeeded.
+    # The post-write re-assessment of the new ISO produces one
+    # unavoidably:
+    #   libburn : SORRY : Read start address 525977s larger than
+    #     number of readable blocks 506240
+    # …because we just shrunk the ISO (smaller squashfs) and the
+    # protective MBR header still records the *original* size. The
+    # GPT and El Torito records inside are correct and self-consistent;
+    # the protective MBR is vestigial and bootloaders don't consult its
+    # size field. Demoting SORRY -> exit 0 lets xorriso warn but still
+    # report success on the actually-completed write.
     local new_iso="${iso_file%.iso}.silvermetal-clean.iso"
     sudo --non-interactive rm -f "${new_iso}"
     echo "post-process: replacing /live/filesystem.squashfs in ISO"
     sudo --non-interactive xorriso \
+        -return_with SORRY 0 \
         -indev   "${iso_file}" \
         -outdev  "${new_iso}" \
         -boot_image any keep \