diff --git a/gtk/Session.cc b/gtk/Session.cc
index f4894b0f4..f4b614514 100644
--- a/gtk/Session.cc
+++ b/gtk/Session.cc
@@ -79,7 +79,7 @@ public:
     void torrents_added();
 
     void add_files(std::vector<Glib::RefPtr<Gio::File>> const& files, bool do_start, bool do_prompt, bool do_notify);
-    int add_ctor(tr_ctor* ctor, bool do_prompt, bool do_notify);
+    void add_ctor(tr_ctor* ctor, bool do_prompt, bool do_notify);
     void add_torrent(Glib::RefPtr<Torrent> const& torrent, bool do_notify);
     bool add_from_url(Glib::ustring const& url);
 
@@ -690,12 +690,12 @@ Glib::RefPtr<Torrent> Session::Impl::create_new_torrent(tr_ctor* ctor)
     return Torrent::create(tor);
 }
 
-int Session::Impl::add_ctor(tr_ctor* ctor, bool do_prompt, bool do_notify)
+void Session::Impl::add_ctor(tr_ctor* ctor, bool do_prompt, bool do_notify)
 {
     auto const* metainfo = tr_ctorGetMetainfo(ctor);
     if (metainfo == nullptr)
     {
-        return TR_PARSE_ERR;
+        return;
     }
 
     if (tr_torrentFindFromMetainfo(get_session(), metainfo) != nullptr)
@@ -709,18 +709,17 @@ int Session::Impl::add_ctor(tr_ctor* ctor, bool do_prompt, bool do_notify)
         }
 
         tr_ctorFree(ctor);
-        return TR_PARSE_DUPLICATE;
+        return;
     }
 
     if (!do_prompt)
     {
         add_torrent(create_new_torrent(ctor), do_notify);
         tr_ctorFree(ctor);
-        return 0;
+        return;
     }
 
     signal_add_prompt_.emit(ctor);
-    return 0;
 }
 
 namespace
diff --git a/gtk/Session.h b/gtk/Session.h
index 51cdbd51b..b323e9db7 100644
--- a/gtk/Session.h
+++ b/gtk/Session.h
@@ -31,8 +31,8 @@ class Session : public Glib::Object
 public:
     enum ErrorCode
     {
-        ERR_ADD_TORRENT_ERR = TR_PARSE_ERR,
-        ERR_ADD_TORRENT_DUP = TR_PARSE_DUPLICATE,
+        ERR_ADD_TORRENT_ERR = 1,
+        ERR_ADD_TORRENT_DUP = 2,
         ERR_NO_MORE_TORRENTS = 1000 /* finished adding a batch */
     };
 
diff --git a/libtransmission/transmission.h b/libtransmission/transmission.h
index 1314fdc94..7ceb95ce5 100644
--- a/libtransmission/transmission.h
+++ b/libtransmission/transmission.h
@@ -808,14 +808,6 @@ void tr_ctorSetFilesWanted(tr_ctor* ctor, tr_file_index_t const* files, tr_file_
            or nullptr if `tr_ctorSetMetainfoFromFile()` wasn't used */
 char const* tr_ctorGetSourceFile(tr_ctor const* ctor);
 
-// TODO(ckerr) remove
-enum tr_parse_result
-{
-    TR_PARSE_OK,
-    TR_PARSE_ERR,
-    TR_PARSE_DUPLICATE
-};
-
 /**
  * Instantiate a single torrent.
  *