diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 4100630..dd56eec 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -598,7 +598,9 @@
 
 	if (nfss->mountd_version || showdefaults)
 		seq_printf(m, ",mountvers=%u", nfss->mountd_version);
-	if (nfss->mountd_port || showdefaults)
+	if ((nfss->mountd_port &&
+		nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
+		showdefaults)
 		seq_printf(m, ",mountport=%u", nfss->mountd_port);
 
 	nfs_show_mountd_netid(m, nfss, showdefaults);