diff --git a/include/libtorrent/config.hpp b/include/libtorrent/config.hpp
index 789d39ff7..92ee5197f 100644
--- a/include/libtorrent/config.hpp
+++ b/include/libtorrent/config.hpp
@@ -201,7 +201,10 @@ POSSIBILITY OF SUCH DAMAGE.
 
 #else
 // FreeBSD has a reasonable iconv signature
-#define TORRENT_ICONV_ARG (const char**)
+// unless we're on glibc
+#ifndef __GLIBC__
+# define TORRENT_ICONV_ARG (const char**)
+#endif
 #endif
 #define TORRENT_HAS_FALLOCATE 0
 #define TORRENT_USE_IFADDRS 1