diff --git a/lib/ftp.c b/lib/ftp.c
index ff8afcba529d3d2b2dde1e148f542f7dc5990e75..08b1cc3bd8ebe70ee4b13cca5e1f37f7df95a878 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -2564,7 +2564,7 @@ CURLcode Curl_ftp_disconnect(struct connectdata *conn)
  *
  * Calls failf()
  */
-CURLcode ftp_mkd(struct connectdata *conn, char *path)
+static CURLcode ftp_mkd(struct connectdata *conn, char *path)
 {
   CURLcode result=CURLE_OK;
   int ftpcode; /* for ftp status */