diff --git a/boot/zephyr/arm_cleanup.c b/boot/zephyr/arm_cleanup.c
new file mode 100644
index 0000000..f313307
--- /dev/null
+++ b/boot/zephyr/arm_cleanup.c
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2020 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+
+void cleanup_arm_nvic(void) {
+	/* Allow any pending interrupts to be recognized */
+	__ISB();
+	__disable_irq();
+
+	/* Disable NVIC interrupts */
+	for (u8_t i = 0; i < ARRAY_SIZE(NVIC->ICER); i++) {
+		NVIC->ICER[i] = 0xFFFFFFFF;
+	}
+	/* Clear pending NVIC interrupts */
+	for (u8_t i = 0; i < ARRAY_SIZE(NVIC->ICPR); i++) {
+		NVIC->ICPR[i] = 0xFFFFFFFF;
+	}
+}