diff --git a/lib/asyn-ares.c b/lib/asyn-ares.c
index 340d3d51ce..10f870a15a 100644
--- a/lib/asyn-ares.c
+++ b/lib/asyn-ares.c
@@ -945,7 +945,6 @@ CURLcode Curl_async_ares_set_dns_local_ip6(struct Curl_easy *data)
   return CURLE_OK;
 #else /* c-ares version too old! */
   (void)data;
-  (void)local_ip6;
   return CURLE_NOT_BUILT_IN;
 #endif
 }