diff --git a/sbin/newfs/mkfs.c b/sbin/newfs/mkfs.c
index 80cb7340c00b..398f36961f60 100644
--- a/sbin/newfs/mkfs.c
+++ b/sbin/newfs/mkfs.c
@@ -562,6 +562,7 @@ mkfs(pp, fsys, fi, fo)
 	sblock.fs_cstotal.cs_nffree = 0;
 	sblock.fs_fmod = 0;
 	sblock.fs_ronly = 0;
+	sblock.fs_clean = 1;
 	/*
 	 * Dump out summary information about file system.
 	 */