diff --git a/lib/ftp.c b/lib/ftp.c
index e3f93870f..f1376d730 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -3076,10 +3076,6 @@ static CURLcode ftp_done(struct connectdata *conn, CURLcode status,
   /* free the dir tree and file parts */
   freedirs(ftpc);
 
-#if defined(HAVE_KRB4) || defined(HAVE_GSSAPI)
-  Curl_sec_fflush_fd(conn, conn->sock[SECONDARYSOCKET]);
-#endif
-
   /* shut down the socket to inform the server we're done */
 
 #ifdef _WIN32_WCE
diff --git a/lib/krb4.h b/lib/krb4.h
index 5dc3971e4..5da1dc6ef 100644
--- a/lib/krb4.h
+++ b/lib/krb4.h
@@ -47,7 +47,6 @@ extern struct Curl_sec_client_mech Curl_krb5_client_mech;
 #endif
 
 CURLcode Curl_krb_kauth(struct connectdata *conn);
-int Curl_sec_fflush_fd(struct connectdata *conn, int fd);
 int Curl_sec_fprintf (struct connectdata *, FILE *, const char *, ...);
 int Curl_sec_getc (struct connectdata *conn, FILE *);
 int Curl_sec_putc (struct connectdata *conn, int, FILE *);
diff --git a/lib/security.c b/lib/security.c
index 5becb0c87..303a1bec6 100644
--- a/lib/security.c
+++ b/lib/security.c
@@ -345,17 +345,6 @@ static ssize_t sec_write(struct connectdata *conn, curl_socket_t fd,
   return tx;
 }
 
-/* FIXME: fd should be a curl_socket_t */
-int Curl_sec_fflush_fd(struct connectdata *conn, int fd)
-{
-  if(conn->data_prot == prot_clear)
-    return 0;
-
-  /* Force a flush by trying to send no data */
-  do_sec_send(conn, fd, NULL, 0);
-  return 0;
-}
-
 /* Matches Curl_send signature */
 static ssize_t sec_send(struct connectdata *conn, int sockindex,
                         const void *buffer, size_t len, CURLcode *err)