diff --git a/lib/ftp.c b/lib/ftp.c
index 568a9b91701b754a02cebc3914f95644dd108a31..1d7b9c28451a43d73bb826c29e2f43f6b3980e5e 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -860,7 +860,8 @@ CURLcode _ftp(struct connectdata *conn)
          * previous lookup.
          */
         he = conn->hp;
-        connectport = data->port; /* we connect to the proxy's port */
+        connectport =
+          (unsigned short)data->port; /* we connect to the proxy's port */
       }
       else {
         /* normal, direct, ftp connection */