diff --git a/src/hb-ot-layout-gsubgpos.hh b/src/hb-ot-layout-gsubgpos.hh
index 8e839b9..6aa2f16 100644
--- a/src/hb-ot-layout-gsubgpos.hh
+++ b/src/hb-ot-layout-gsubgpos.hh
@@ -1674,6 +1674,8 @@
     ;
   }
 
+  void collect_variation_indices (hb_collect_variation_indices_context_t *c) const {}
+
   void collect_glyphs (hb_collect_glyphs_context_t *c) const
   {
     (this+coverage).collect_coverage (c->input);
@@ -1814,6 +1816,8 @@
     ;
   }
 
+  void collect_variation_indices (hb_collect_variation_indices_context_t *c) const {}
+
   void collect_glyphs (hb_collect_glyphs_context_t *c) const
   {
     (this+coverage).collect_coverage (c->input);
@@ -1964,6 +1968,8 @@
     recurse_lookups (c, lookupCount, lookupRecord);
   }
 
+  void collect_variation_indices (hb_collect_variation_indices_context_t *c) const {}
+
   void collect_glyphs (hb_collect_glyphs_context_t *c) const
   {
     (this+coverageZ[0]).collect_coverage (c->input);
@@ -2562,6 +2568,8 @@
     ;
   }
 
+  void collect_variation_indices (hb_collect_variation_indices_context_t *c) const {}
+
   void collect_glyphs (hb_collect_glyphs_context_t *c) const
   {
     (this+coverage).collect_coverage (c->input);
@@ -2706,6 +2714,8 @@
     ;
   }
 
+  void collect_variation_indices (hb_collect_variation_indices_context_t *c) const {}
+
   void collect_glyphs (hb_collect_glyphs_context_t *c) const
   {
     (this+coverage).collect_coverage (c->input);
@@ -2904,6 +2914,8 @@
     recurse_lookups (c, lookup.len, lookup.arrayZ);
   }
 
+  void collect_variation_indices (hb_collect_variation_indices_context_t *c) const {}
+
   void collect_glyphs (hb_collect_glyphs_context_t *c) const
   {
     const OffsetArrayOf<Coverage> &input = StructAfter<OffsetArrayOf<Coverage>> (backtrack);
@@ -3082,6 +3094,9 @@
     return_trace (get_subtable<typename T::SubTable> ().dispatch (c, get_type (), hb_forward<Ts> (ds)...));
   }
 
+  void collect_variation_indices (hb_collect_variation_indices_context_t *c) const
+  { dispatch (c); }
+
   /* This is called from may_dispatch() above with hb_sanitize_context_t. */
   bool sanitize (hb_sanitize_context_t *c) const
   {