diff --git a/boards/posix/native_sim/native_sim.dts b/boards/posix/native_sim/native_sim.dts
index 682049c63c..76f34769b5 100644
--- a/boards/posix/native_sim/native_sim.dts
+++ b/boards/posix/native_sim/native_sim.dts
@@ -23,6 +23,7 @@
 		zephyr,flash-controller = &flashcontroller0;
 		zephyr,display = &sdl_dc;
 		zephyr,canbus = &can_loopback0;
+		zephyr,code-partition = &slot0_partition;
 	};
 
 	aliases {
diff --git a/subsys/dfu/boot/mcuboot.c b/subsys/dfu/boot/mcuboot.c
index 3b5c08173f..4f03c7c9e2 100644
--- a/subsys/dfu/boot/mcuboot.c
+++ b/subsys/dfu/boot/mcuboot.c
@@ -34,6 +34,9 @@
 #define BOOT_HEADER_MAGIC_V1 0x96f3b83d
 #define BOOT_HEADER_SIZE_V1 32
 
+/* Get active partition. zephyr,code-partition chosen node must be defined */
+#define ACTIVE_SLOT_FLASH_AREA_ID DT_FIXED_PARTITION_ID(DT_CHOSEN(zephyr_code_partition))
+
 /*
  * Raw (on-flash) representation of the v1 image header.
  */
@@ -213,14 +216,18 @@ bool boot_is_img_confirmed(void)
 
 int boot_write_img_confirmed(void)
 {
-	int rc;
+	const struct flash_area *fa;
+	int rc = 0;
 
-	rc = boot_set_confirmed();
-	if (rc) {
+	if (flash_area_open(ACTIVE_SLOT_FLASH_AREA_ID, &fa) != 0) {
 		return -EIO;
 	}
 
-	return 0;
+	rc = boot_set_next(fa, true, true);
+
+	flash_area_close(fa);
+
+	return rc;
 }
 
 int boot_write_img_confirmed_multi(int image_index)