diff --git a/configure.ac b/configure.ac
index 5f3a0d32..d95c34ea 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 AC_INIT(rtorrent, 0.8.9, jaris@ifi.uio.no)
 
-AC_DEFINE(API_VERSION, 2, api version)
+AC_DEFINE(API_VERSION, 3, api version)
 
 AM_INIT_AUTOMAKE
 AM_CONFIG_HEADER(config.h)
diff --git a/src/command_download.cc b/src/command_download.cc
index f84390d6..14394e6a 100644
--- a/src/command_download.cc
+++ b/src/command_download.cc
@@ -328,6 +328,16 @@ apply_d_add_peer(core::Download* download, const std::string& arg) {
   torrent::connection_manager()->resolver()(host, (int)rak::socket_address::pf_inet, SOCK_STREAM, call_add_d_peer_t(download, port));
 }
 
+torrent::Object
+d_chunks_seen(core::Download* download) {
+  const uint8_t* seen = download->download()->chunks_seen();
+
+  if (seen == NULL)
+    return std::string();
+  else
+    return std::string((const char*)seen, download->download()->file_list()->size_chunks());
+}
+
 torrent::Object
 f_multicall(core::Download* download, const torrent::Object::list_type& args) {
   if (args.empty())
@@ -813,6 +823,8 @@ initialize_command_download() {
   CMD2_DL         ("d.size_pex",       CMD2_ON_DL(size_pex));
   CMD2_DL         ("d.max_size_pex",   CMD2_ON_DL(max_size_pex));
 
+  CMD2_DL         ("d.chunks_seen",      tr1::bind(&d_chunks_seen, tr1::placeholders::_1));
+
   CMD2_DL         ("d.completed_bytes",  CMD2_ON_FL(completed_bytes));
   CMD2_DL         ("d.completed_chunks", CMD2_ON_FL(completed_chunks));
   CMD2_DL         ("d.left_bytes",       CMD2_ON_FL(left_bytes));