diff --git a/sys/fs/tmpfs/tmpfs_subr.c b/sys/fs/tmpfs/tmpfs_subr.c
--- a/sys/fs/tmpfs/tmpfs_subr.c
+++ b/sys/fs/tmpfs/tmpfs_subr.c
@@ -349,7 +349,7 @@
 
 	node = mem;
 	node->tn_id = 0;
-	mtx_init(&node->tn_interlock, "tmpfsni", NULL, MTX_DEF);
+	mtx_init(&node->tn_interlock, "tmpfsni", NULL, MTX_DEF | MTX_NEW);
 	node->tn_gen = arc4random();
 	return (0);
 }