diff --git a/boot/zephyr/serial_adapter.c b/boot/zephyr/serial_adapter.c
index e04e0b1..f51dc94 100644
--- a/boot/zephyr/serial_adapter.c
+++ b/boot/zephyr/serial_adapter.c
@@ -197,5 +197,10 @@
 
 	uart_irq_rx_enable(uart_dev);
 
+	/* Enable all interrupts unconditionally. Note that this is due
+	 * to Zephyr issue #8393. This should be removed once the
+	 * issue is fixed in upstream Zephyr. */
+	irq_unlock(0);
+
 	return 0;
 }