diff --git a/src/hb-ot-layout-common-private.hh b/src/hb-ot-layout-common-private.hh
index f8749a1b8..fc69c89f9 100644
--- a/src/hb-ot-layout-common-private.hh
+++ b/src/hb-ot-layout-common-private.hh
@@ -291,7 +291,7 @@ struct Lookup
 
   inline bool sanitize (SANITIZE_ARG_DEF) {
     TRACE_SANITIZE ();
-    if (!(SANITIZE_SELF/*XXXXXXXXXXXXXX*/ () && SANITIZE_THIS (subTable))) return false;
+    if (!(SANITIZE (lookupType) && SANITIZE (lookupFlag) && SANITIZE_THIS (subTable))) return false;
     if (HB_UNLIKELY (lookupFlag & LookupFlag::UseMarkFilteringSet))
     {
       USHORT &markFilteringSet = NEXT (USHORT, subTable);