diff --git a/tests/subsys/dfu/img_util/testcase.yaml b/tests/subsys/dfu/img_util/testcase.yaml
index 89d44339572..e90fb0842b1 100644
--- a/tests/subsys/dfu/img_util/testcase.yaml
+++ b/tests/subsys/dfu/img_util/testcase.yaml
@@ -1,18 +1,15 @@
+common:
+  platform_allow:
+    - nrf52840dk_nrf52840
+    - native_posix
+    - native_posix_64
+    - native_sim
+    - native_sim_64
+  integration_platforms:
+    - nrf52840dk_nrf52840
 tests:
   dfu.image_util:
-    platform_allow:
-      - nrf52840dk_nrf52840
-      - native_posix
-      - native_posix_64
     tags: dfu_image_util
-    integration_platforms:
-      - nrf52840dk_nrf52840
   dfu.image_util.progressive:
     extra_args: OVERLAY_CONFIG=progressively_overlay.conf
-    platform_allow:
-      - nrf52840dk_nrf52840
-      - native_posix
-      - native_posix_64
     tags: dfu_image_util
-    integration_platforms:
-      - nrf52840dk_nrf52840
diff --git a/tests/subsys/dfu/mcuboot/testcase.yaml b/tests/subsys/dfu/mcuboot/testcase.yaml
index c05a05ae5df..6b630c71865 100644
--- a/tests/subsys/dfu/mcuboot/testcase.yaml
+++ b/tests/subsys/dfu/mcuboot/testcase.yaml
@@ -4,6 +4,8 @@ tests:
       - nrf52840dk_nrf52840
       - native_posix
       - native_posix_64
+      - native_sim
+      - native_sim_64
     tags: dfu_mcuboot
     integration_platforms:
       - nrf52840dk_nrf52840
diff --git a/tests/subsys/dfu/mcuboot_multi/native_posix_64.overlay b/tests/subsys/dfu/mcuboot_multi/native_posix_64.overlay
deleted file mode 100644
index 5166674f432..00000000000
--- a/tests/subsys/dfu/mcuboot_multi/native_posix_64.overlay
+++ /dev/null
@@ -1,37 +0,0 @@
-/*
- * Copyright (c) 2020 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-/delete-node/ &scratch_partition;
-/delete-node/ &storage_partition;
-
-&flash0 {
-	partitions {
-		compatible = "fixed-partitions";
-		#address-cells = <1>;
-		#size-cells = <1>;
-
-		boot_partition: partition@0 {
-			label = "mcuboot";
-			reg = <0x00000000 0x0000C000>;
-		};
-		slot0_partition: partition@c000 {
-			label = "image-0";
-			reg = <0x0000C000 0x00069000>;
-		};
-		slot1_partition: partition@75000 {
-			label = "image-1";
-			reg = <0x00075000 0x00069000>;
-		};
-		slot2_partition: partition@DE000 {
-			label = "image-2";
-			reg = <0x000DE000 0x00069000>;
-		};
-		slot3_partition: partition@146000 {
-			label = "image-3";
-			reg = <0x00146000 0x00069000>;
-		};
-	};
-};
diff --git a/tests/subsys/dfu/mcuboot_multi/native_posix.overlay b/tests/subsys/dfu/mcuboot_multi/native_sim.overlay
similarity index 100%
rename from tests/subsys/dfu/mcuboot_multi/native_posix.overlay
rename to tests/subsys/dfu/mcuboot_multi/native_sim.overlay
diff --git a/tests/subsys/dfu/mcuboot_multi/native_sim_64.overlay b/tests/subsys/dfu/mcuboot_multi/native_sim_64.overlay
new file mode 100644
index 00000000000..3e51723713a
--- /dev/null
+++ b/tests/subsys/dfu/mcuboot_multi/native_sim_64.overlay
@@ -0,0 +1,7 @@
+/*
+ * Copyright (c) 2020 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "native_sim.overlay"
diff --git a/tests/subsys/dfu/mcuboot_multi/testcase.yaml b/tests/subsys/dfu/mcuboot_multi/testcase.yaml
index dbebd3fddbd..742bbe38ce6 100644
--- a/tests/subsys/dfu/mcuboot_multi/testcase.yaml
+++ b/tests/subsys/dfu/mcuboot_multi/testcase.yaml
@@ -2,8 +2,8 @@ tests:
   dfu.mcuboot.multiimage:
     platform_allow:
       - nrf52840dk_nrf52840
-      - native_posix
-      - native_posix_64
+      - native_sim
+      - native_sim_64
     tags: dfu_mcuboot
     integration_platforms:
       - nrf52840dk_nrf52840