diff --git a/lib/libfetch/ftp.c b/lib/libfetch/ftp.c
index 4e650b93c0a..dd58c0dbd7b 100644
--- a/lib/libfetch/ftp.c
+++ b/lib/libfetch/ftp.c
@@ -929,7 +929,7 @@ ftp_authenticate(conn_t *conn, struct url *url, struct url *purl)
 		if (*pwd == '\0')
 			pwd = getenv("FTP_PASSWORD");
 		if (pwd == NULL || *pwd == '\0') {
-			if ((logname = getlogin()) == 0)
+			if ((logname = getlogin()) == NULL)
 				logname = FTP_ANONYMOUS_USER;
 			if ((len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname)) < 0)
 				len = 0;