diff --git a/test/test_archive_iso9660.sh b/test/test_archive_iso9660.sh
index 5658f7a98..fc999bd47 100755
--- a/test/test_archive_iso9660.sh
+++ b/test/test_archive_iso9660.sh
@@ -7,4 +7,7 @@ DST="$(pwd)/test/tmp/${SRC_BASE}.iso"
 mkdir -p test/tmp
 rm -f "$DST"
 mkisofs -quiet -l -o "$DST" "$SRC"
-./test/run_input "$DST/${SRC_BASE}" |diff "$SRC" -
+
+# Using an odd chunk size to check whether the plugin can cope with
+# partial sectors
+./test/run_input --chunk-size=1337 "$DST/${SRC_BASE}" |diff "$SRC" -