diff --git a/lib/libufs/cgroup.c b/lib/libufs/cgroup.c
index 90b28eadad2c..2058d16e9b6d 100644
--- a/lib/libufs/cgroup.c
+++ b/lib/libufs/cgroup.c
@@ -268,6 +268,10 @@ cgwrite1(struct uufsd *disk, int cg)
 	static char errmsg[BUFSIZ];
 
 	if (cg == disk->d_cg.cg_cgx) {
+		if (ufs_disk_write(disk) == -1) {
+			ERROR(disk, "failed to open disk for writing");
+			return (-1);
+		}
 		if (cgput(disk->d_fd, &disk->d_fs, &disk->d_cg) == 0)
 			return (0);
 		ERROR(disk, NULL);