diff --git a/include/libtorrent/config.hpp b/include/libtorrent/config.hpp
index 40112c4b7..29e5fc0e1 100644
--- a/include/libtorrent/config.hpp
+++ b/include/libtorrent/config.hpp
@@ -175,7 +175,6 @@ POSSIBILITY OF SUCH DAMAGE.
 #define TORRENT_USE_ICONV 0
 #define TORRENT_USE_LOCALE 1
 #endif
-#define TORRENT_ICONV_ARG (const char**)
 #define TORRENT_USE_RLIMIT 0
 #define TORRENT_USE_NETLINK 0
 #define TORRENT_USE_GETADAPTERSADDRESSES 1