diff --git a/configure.ac b/configure.ac
index cdd04e82..87b84b04 100644
--- a/configure.ac
+++ b/configure.ac
@@ -64,7 +64,6 @@ if test ${with_xmlrpc_c+y} && test ${with_xmlrpc_tinyxml2+y}; then
   AC_MSG_ERROR([--with-xmlrpc-c and --with-xmlrpc-tinyxml2 cannot be used together. Please choose only one])
 fi
 
-AC_DEFINE(HAVE_CONFIG_H, 1, true if config.h was included)
 AC_DEFINE(USER_AGENT, [std::string(PACKAGE "/" VERSION "/") + torrent::version()], Http user agent)
 
 AC_CHECK_FUNCS(posix_memalign)