diff --git a/lib/curl_setup.h b/lib/curl_setup.h
index 517bb83bfacf0849ef289918bf87790db84cc6f5..9f511f228fcc82033611d591f093b424e948cd73 100644
--- a/lib/curl_setup.h
+++ b/lib/curl_setup.h
@@ -527,6 +527,7 @@
 #  define CURLRES_ARES
 /* now undef the stock libc functions just to avoid them being used */
 #  undef HAVE_GETADDRINFO
+#  undef HAVE_FREEADDRINFO
 #  undef HAVE_GETHOSTBYNAME
 #elif defined(USE_THREADS_POSIX) || defined(USE_THREADS_WIN32)
 #  define CURLRES_ASYNCH