diff --git a/src/hb-ot-layout-gpos-private.hh b/src/hb-ot-layout-gpos-private.hh
index c8148937a..f02824513 100644
--- a/src/hb-ot-layout-gpos-private.hh
+++ b/src/hb-ot-layout-gpos-private.hh
@@ -1460,7 +1460,6 @@ struct PosLookupSubTable
 
   inline bool sanitize (hb_sanitize_context_t *context, unsigned int lookup_type) {
     TRACE_SANITIZE ();
-    if (!u.sub_format.sanitize (context)) return false;
     switch (lookup_type) {
     case Single:		return u.single.sanitize (context);
     case Pair:			return u.pair.sanitize (context);
diff --git a/src/hb-ot-layout-gsub-private.hh b/src/hb-ot-layout-gsub-private.hh
index 494e2deab..849a20c1c 100644
--- a/src/hb-ot-layout-gsub-private.hh
+++ b/src/hb-ot-layout-gsub-private.hh
@@ -732,7 +732,6 @@ struct SubstLookupSubTable
 
   inline bool sanitize (hb_sanitize_context_t *context, unsigned int lookup_type) {
     TRACE_SANITIZE ();
-    if (!u.sub_format.sanitize (context)) return false;
     switch (lookup_type) {
     case Single:		return u.single.sanitize (context);
     case Multiple:		return u.multiple.sanitize (context);