diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 568ba64b22d61ea15efb3aa279488206aaca20f0..284f0e62a927ebe0852513e53acd57296d10f262 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -914,13 +914,14 @@ int proc_watchdog_thresh(struct ctl_table *table, int write,
 		goto out;
 
 	/*
-	 * Update the sample period.
-	 * Restore 'watchdog_thresh' on failure.
+	 * Update the sample period. Restore on failure.
 	 */
 	set_sample_period();
 	err = proc_watchdog_update();
-	if (err)
+	if (err) {
 		watchdog_thresh = old;
+		set_sample_period();
+	}
 out:
 	mutex_unlock(&watchdog_proc_mutex);
 	return err;