diff --git a/lib/ftp.c b/lib/ftp.c
index ad9fb6054c1bbf9f7c6d2a2097d572326fc7a868..694ff91b4f17ae866761310000647908299c92c4 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -1066,7 +1066,7 @@ CURLcode ftp_use_port(struct connectdata *conn)
   struct sockaddr *sa=(struct sockaddr *)&ss;
   unsigned char *ap;
   unsigned char *pp;
-  char portmsgbuf[4096], tmp[4096];
+  char portmsgbuf[1024], tmp[1024];
 
   const char *mode[] = { "EPRT", "LPRT", "PORT", NULL };
   char **modep;