diff --git a/src/hb-repacker.hh b/src/hb-repacker.hh
index 6af802f..aefa7c8 100644
--- a/src/hb-repacker.hh
+++ b/src/hb-repacker.hh
@@ -249,58 +249,6 @@
   }
 
   /*
-   * Generates a new topological sorting of graph using Kahn's
-   * algorithm: https://en.wikipedia.org/wiki/Topological_sorting#Algorithms
-   */
-  void sort_kahn ()
-  {
-    positions_invalid = true;
-
-    if (vertices_.length <= 1) {
-      // Graph of 1 or less doesn't need sorting.
-      return;
-    }
-
-    hb_vector_t<unsigned> queue;
-    hb_vector_t<vertex_t> &sorted_graph = vertices_scratch_;
-    if (unlikely (!check_success (sorted_graph.resize (vertices_.length)))) return;
-    hb_vector_t<unsigned> id_map;
-    if (unlikely (!check_success (id_map.resize (vertices_.length)))) return;
-
-    hb_vector_t<unsigned> removed_edges;
-    if (unlikely (!check_success (removed_edges.resize (vertices_.length)))) return;
-    update_parents ();
-
-    queue.push (root_idx ());
-    int new_id = vertices_.length - 1;
-
-    while (!queue.in_error () && queue.length)
-    {
-      unsigned next_id = queue[0];
-      queue.remove (0);
-
-      vertex_t& next = vertices_[next_id];
-      sorted_graph[new_id] = next;
-      id_map[next_id] = new_id--;
-
-      for (const auto& link : next.obj.all_links ()) {
-        removed_edges[link.objidx]++;
-        if (!(vertices_[link.objidx].incoming_edges () - removed_edges[link.objidx]))
-          queue.push (link.objidx);
-      }
-    }
-
-    check_success (!queue.in_error ());
-    check_success (!sorted_graph.in_error ());
-    if (!check_success (new_id == -1))
-      print_orphaned_nodes ();
-
-    remap_all_obj_indices (id_map, &sorted_graph);
-
-    hb_swap (vertices_, sorted_graph);
-  }
-
-  /*
    * Generates a new topological sorting of graph ordered by the shortest
    * distance to each node.
    */
@@ -1218,7 +1166,6 @@
   // Kahn sort is ~twice as fast as shortest distance sort and works for many fonts
   // so try it first to save time.
   graph_t sorted_graph (packed);
-  sorted_graph.sort_kahn ();
   if (!sorted_graph.will_overflow ())
   {
     return sorted_graph.serialize ();
diff --git a/src/test-repacker.cc b/src/test-repacker.cc
index 3a2536a..17e0d26 100644
--- a/src/test-repacker.cc
+++ b/src/test-repacker.cc
@@ -729,26 +729,6 @@
 }
 
 static void
-populate_serializer_complex_1 (hb_serialize_context_t* c)
-{
-  c->start_serialize<char> ();
-
-  unsigned obj_4 = add_object ("jkl", 3, c);
-  unsigned obj_3 = add_object ("ghi", 3, c);
-
-  start_object ("def", 3, c);
-  add_offset (obj_3, c);
-  unsigned obj_2 = c->pop_pack (false);
-
-  start_object ("abc", 3, c);
-  add_offset (obj_2, c);
-  add_offset (obj_4, c);
-  c->pop_pack (false);
-
-  c->end_serialize();
-}
-
-static void
 populate_serializer_complex_2 (hb_serialize_context_t* c)
 {
   c->start_serialize<char> ();
@@ -831,68 +811,6 @@
   c->end_serialize();
 }
 
-static void test_sort_kahn_1 ()
-{
-  size_t buffer_size = 100;
-  void* buffer = malloc (buffer_size);
-  hb_serialize_context_t c (buffer, buffer_size);
-  populate_serializer_complex_1 (&c);
-
-  graph_t graph (c.object_graph ());
-  graph.sort_kahn ();
-
-  assert(strncmp (graph.object (3).head, "abc", 3) == 0);
-  assert(graph.object (3).real_links.length == 2);
-  assert(graph.object (3).real_links[0].objidx == 2);
-  assert(graph.object (3).real_links[1].objidx == 1);
-
-  assert(strncmp (graph.object (2).head, "def", 3) == 0);
-  assert(graph.object (2).real_links.length == 1);
-  assert(graph.object (2).real_links[0].objidx == 0);
-
-  assert(strncmp (graph.object (1).head, "jkl", 3) == 0);
-  assert(graph.object (1).real_links.length == 0);
-
-  assert(strncmp (graph.object (0).head, "ghi", 3) == 0);
-  assert(graph.object (0).real_links.length == 0);
-
-  free (buffer);
-}
-
-static void test_sort_kahn_2 ()
-{
-  size_t buffer_size = 100;
-  void* buffer = malloc (buffer_size);
-  hb_serialize_context_t c (buffer, buffer_size);
-  populate_serializer_complex_2 (&c);
-
-  graph_t graph (c.object_graph ());
-  graph.sort_kahn ();
-
-
-  assert(strncmp (graph.object (4).head, "abc", 3) == 0);
-  assert(graph.object (4).real_links.length == 3);
-  assert(graph.object (4).real_links[0].objidx == 3);
-    assert(graph.object (4).real_links[1].objidx == 0);
-  assert(graph.object (4).real_links[2].objidx == 2);
-
-  assert(strncmp (graph.object (3).head, "def", 3) == 0);
-  assert(graph.object (3).real_links.length == 1);
-  assert(graph.object (3).real_links[0].objidx == 1);
-
-  assert(strncmp (graph.object (2).head, "mn", 2) == 0);
-  assert(graph.object (2).real_links.length == 0);
-
-  assert(strncmp (graph.object (1).head, "ghi", 3) == 0);
-  assert(graph.object (1).real_links.length == 1);
-  assert(graph.object (1).real_links[0].objidx == 0);
-
-  assert(strncmp (graph.object (0).head, "jkl", 3) == 0);
-  assert(graph.object (0).real_links.length == 0);
-
-  free (buffer);
-}
-
 static void test_sort_shortest ()
 {
   size_t buffer_size = 100;
@@ -1336,8 +1254,6 @@
 main (int argc, char **argv)
 {
   test_serialize ();
-  test_sort_kahn_1 ();
-  test_sort_kahn_2 ();
   test_sort_shortest ();
   test_will_overflow_1 ();
   test_will_overflow_2 ();