diff --git a/lib/version.c b/lib/version.c
index 8191f9593b..63ed63c416 100644
--- a/lib/version.c
+++ b/lib/version.c
@@ -182,6 +182,9 @@ static curl_version_info_data version_info = {
 #endif
 #ifdef CURLDEBUG
   | CURL_VERSION_DEBUG
+#endif
+#ifdef USE_ARES
+  | CURL_VERSION_ASYNCHDNS
 #endif
   ,
   NULL, /* ssl_version */