diff --git a/configure.ac b/configure.ac
index d4a8632..dfa59b5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -30,7 +30,8 @@ case $host_os in
 		;;
 	*mingw*)
 		HOST_OS=win
-		CFLAGS="$CFLAGS -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_POSIX_SOURCE -D_GNU_SOURCE"
+		CFLAGS="$CFLAGS -D_GNU_SOURCE -D_POSIX -D_POSIX_SOURCE -D_REENTRANT -D_POSIX_THREAD_SAFE_FUNCTIONS -DWIN32_LEAN_AND_MEAN -D_WIN32_WINNT=0x0600 -DOPENSSL_NO_SPEED -D__USE_MINGW_ANSI_STDIO"
+		AC_SUBST([PLATFORM_LDADD], ['-lws2_32'])
 		;;
 	*) ;;
 esac