diff --git a/lib/ftp.c b/lib/ftp.c
index 7b177468c..49dd5ae4f 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -780,7 +780,7 @@ static CURLcode ftp_state_use_port(struct connectdata *conn,
    */
   struct Curl_sockaddr_storage ss;
   struct addrinfo *res, *ai;
-  size_t sslen;
+  socklen_t sslen;
   char hbuf[NI_MAXHOST];
   struct sockaddr *sa=(struct sockaddr *)&ss;
   unsigned char *ap;
@@ -812,7 +812,7 @@ static CURLcode ftp_state_use_port(struct connectdata *conn,
       return CURLE_FTP_PORT_FAILED;
     }
 
-    rc = getnameinfo((struct sockaddr *)&ss, sslen, hbuf, sizeof(hbuf), NULL,
+    rc = getnameinfo((struct sockaddr *)&ss, (size_t)sslen, hbuf, sizeof(hbuf), NULL,
                      0, NIFLAGS);
     if(rc) {
       failf(data, "getnameinfo() returned %d\n", rc);
@@ -921,7 +921,7 @@ static CURLcode ftp_state_use_port(struct connectdata *conn,
     if (EPRT == fcmd) {
       if (eprtaf < 0)
         continue;
-      if (getnameinfo((struct sockaddr *)&ss, sslen,
+      if (getnameinfo((struct sockaddr *)&ss, (size_t)sslen,
                       portmsgbuf, sizeof(portmsgbuf), tmp, sizeof(tmp),
                       NIFLAGS))
         continue;