diff --git a/src/hb-ot-map-private.hh b/src/hb-ot-map-private.hh
index 8692caa93..fc5ce6637 100644
--- a/src/hb-ot-map-private.hh
+++ b/src/hb-ot-map-private.hh
@@ -139,12 +139,6 @@ struct hb_ot_map_t
 
   private:
 
-  HB_INTERNAL void add_lookups (hb_face_t    *face,
-				unsigned int  table_index,
-				unsigned int  feature_index,
-				hb_mask_t     mask,
-				bool          auto_zwj);
-
   hb_mask_t global_mask;
 
   hb_prealloced_array_t<feature_map_t, 8> features;
@@ -182,7 +176,7 @@ struct hb_ot_map_builder_t
   inline void add_gpos_pause (hb_ot_map_t::pause_func_t pause_func)
   { add_pause (1, pause_func); }
 
-  HB_INTERNAL void compile (struct hb_ot_map_t &m);
+  HB_INTERNAL void compile (hb_ot_map_t &m);
 
   inline void finish (void) {
     feature_infos.finish ();
@@ -194,6 +188,13 @@ struct hb_ot_map_builder_t
 
   private:
 
+  HB_INTERNAL void add_lookups (hb_ot_map_t   &m,
+				hb_face_t     *face,
+				unsigned int   table_index,
+				unsigned int   feature_index,
+				hb_mask_t      mask,
+				bool           auto_zwj);
+
   struct feature_info_t {
     hb_tag_t tag;
     unsigned int seq; /* sequence#, used for stable sorting only */
diff --git a/src/hb-ot-map.cc b/src/hb-ot-map.cc
index 17e3f4065..a45c2f9e8 100644
--- a/src/hb-ot-map.cc
+++ b/src/hb-ot-map.cc
@@ -32,11 +32,12 @@
 
 
 void
-hb_ot_map_t::add_lookups (hb_face_t    *face,
-			  unsigned int  table_index,
-			  unsigned int  feature_index,
-			  hb_mask_t     mask,
-			  bool          auto_zwj)
+hb_ot_map_builder_t::add_lookups (hb_ot_map_t  &m,
+				  hb_face_t    *face,
+				  unsigned int  table_index,
+				  unsigned int  feature_index,
+				  hb_mask_t     mask,
+				  bool          auto_zwj)
 {
   unsigned int lookup_indices[32];
   unsigned int offset, len;
@@ -57,7 +58,7 @@ hb_ot_map_t::add_lookups (hb_face_t    *face,
     {
       if (lookup_indices[i] >= table_lookup_count)
 	continue;
-      hb_ot_map_t::lookup_map_t *lookup = lookups[table_index].push ();
+      hb_ot_map_t::lookup_map_t *lookup = m.lookups[table_index].push ();
       if (unlikely (!lookup))
         return;
       lookup->mask = mask;
@@ -268,17 +269,17 @@ hb_ot_map_builder_t::compile (hb_ot_map_t &m)
     {
       if (required_feature_index[table_index] != HB_OT_LAYOUT_NO_FEATURE_INDEX &&
 	  required_feature_stage[table_index] == stage)
-	m.add_lookups (face, table_index,
-		       required_feature_index[table_index],
-		       1 /* mask */,
-		       true /* auto_zwj */);
+	add_lookups (m, face, table_index,
+		     required_feature_index[table_index],
+		     1 /* mask */,
+		     true /* auto_zwj */);
 
       for (unsigned i = 0; i < m.features.len; i++)
         if (m.features[i].stage[table_index] == stage)
-	  m.add_lookups (face, table_index,
-			 m.features[i].index[table_index],
-			 m.features[i].mask,
-			 m.features[i].auto_zwj);
+	  add_lookups (m, face, table_index,
+		       m.features[i].index[table_index],
+		       m.features[i].mask,
+		       m.features[i].auto_zwj);
 
       /* Sort lookups and merge duplicates */
       if (last_num_lookups < m.lookups[table_index].len)