diff --git a/lib/http_proxy.h b/lib/http_proxy.h
index 058a29db9..9c4f0207d 100644
--- a/lib/http_proxy.h
+++ b/lib/http_proxy.h
@@ -35,7 +35,7 @@ CURLcode Curl_proxyCONNECT(struct connectdata *conn,
 CURLcode Curl_proxy_connect(struct connectdata *conn);
 
 #else
-#define Curl_proxyCONNECT(x,y,z,w) CURLE_NOT_BUILT_IN
+#define Curl_proxyCONNECT(x,y,z,w,v) CURLE_NOT_BUILT_IN
 #define Curl_proxy_connect(x) CURLE_OK
 #endif