diff --git a/drivers/char/watchdog/at32ap700x_wdt.c b/drivers/char/watchdog/at32ap700x_wdt.c
index f08ea94..a3e2887 100644
--- a/drivers/char/watchdog/at32ap700x_wdt.c
+++ b/drivers/char/watchdog/at32ap700x_wdt.c
@@ -257,6 +257,7 @@
 {
 	if (wdt && platform_get_drvdata(pdev) == wdt) {
 		misc_deregister(&wdt->miscdev);
+		iounmap(wdt->regs);
 		kfree(wdt);
 		wdt = NULL;
 		platform_set_drvdata(pdev, NULL);