diff --git a/fontland/fontland/harfbuzz-helper.rkt b/fontland/fontland/harfbuzz-helper.rkt
index ca8ca470..00f980ae 100644
--- a/fontland/fontland/harfbuzz-helper.rkt
+++ b/fontland/fontland/harfbuzz-helper.rkt
@@ -167,6 +167,6 @@
     HB_SCRIPT_MEDEFAIDRIN
     HB_SCRIPT_OLD_SOGDIAN
     HB_SCRIPT_SOGDIAN
-    HB_SCRIPT_INVALID
+    HB_SCRIPT_INVALID = ,(->tag #"\0\0\0\0")
     _HB_SCRIPT_MAX_VALUE
     _HB_SCRIPT_MAX_VALUE_SIGNED))
\ No newline at end of file