diff --git a/subsys/dfu/Kconfig b/subsys/dfu/Kconfig
index f998b2ef9f2..121fa3964f6 100644
--- a/subsys/dfu/Kconfig
+++ b/subsys/dfu/Kconfig
@@ -89,7 +89,7 @@ if !MCUBOOT
 config UPDATEABLE_IMAGE_NUMBER
 	int "Number of updateable images"
 	default 1
-	range 1 2
+	range 1 3
 	help
 	  If value is set to 2 or greater then, this enables support needed when
 	  application is combined with MCUboot multi-image boot.
diff --git a/subsys/mgmt/mcumgr/grp/img_mgmt/Kconfig b/subsys/mgmt/mcumgr/grp/img_mgmt/Kconfig
index 641e16bd703..81fc57d9238 100644
--- a/subsys/mgmt/mcumgr/grp/img_mgmt/Kconfig
+++ b/subsys/mgmt/mcumgr/grp/img_mgmt/Kconfig
@@ -46,7 +46,7 @@ endif
 config MCUMGR_GRP_IMG_UPDATABLE_IMAGE_NUMBER
 	int "Number of supported images"
 	default UPDATEABLE_IMAGE_NUMBER
-	range 1 2
+	range 1 3
 	help
 	  Sets how many application images are supported (pairs of secondary and primary slots).
 	  Setting this to 2 requires MCUMGR_TRANSPORT_NETBUF_SIZE to be at least 512b.
diff --git a/subsys/mgmt/mcumgr/grp/img_mgmt/src/img_mgmt.c b/subsys/mgmt/mcumgr/grp/img_mgmt/src/img_mgmt.c
index 0d733ce7abc..300948d5c88 100644
--- a/subsys/mgmt/mcumgr/grp/img_mgmt/src/img_mgmt.c
+++ b/subsys/mgmt/mcumgr/grp/img_mgmt/src/img_mgmt.c
@@ -41,43 +41,38 @@
 #define FIXED_PARTITION_IS_RUNNING_APP_PARTITION(label)	\
 	 (FIXED_PARTITION_OFFSET(label) == CONFIG_FLASH_LOAD_OFFSET)
 
-#if FIXED_PARTITION_EXISTS(slot0_partition)
-#if FIXED_PARTITION_IS_RUNNING_APP_PARTITION(slot0_partition)
-#define NUMBER_OF_ACTIVE_IMAGE 0
-#endif
-#endif
+BUILD_ASSERT(sizeof(struct image_header) == IMAGE_HEADER_SIZE,
+	     "struct image_header not required size");
 
-#if !defined(NUMBER_OF_ACTIVE_IMAGE) && FIXED_PARTITION_EXISTS(slot0_ns_partition)
-#if FIXED_PARTITION_IS_RUNNING_APP_PARTITION(slot0_ns_partition)
-#define NUMBER_OF_ACTIVE_IMAGE 0
+#if CONFIG_MCUMGR_GRP_IMG_UPDATABLE_IMAGE_NUMBER >= 2
+#if FIXED_PARTITION_EXISTS(slot0_ns_partition) &&			\
+	FIXED_PARTITION_IS_RUNNING_APP_PARTITION(slot0_ns_partition)
+#define ACTIVE_IMAGE_IS 0
+#elif FIXED_PARTITION_EXISTS(slot0_partition) &&			\
+	FIXED_PARTITION_IS_RUNNING_APP_PARTITION(slot0_partition)
+#define ACTIVE_IMAGE_IS 0
+#elif FIXED_PARTITION_EXISTS(slot1_partition) &&			\
+	FIXED_PARTITION_IS_RUNNING_APP_PARTITION(slot1_partition)
+#define ACTIVE_IMAGE_IS 0
+#elif FIXED_PARTITION_EXISTS(slot2_partition) &&			\
+	FIXED_PARTITION_IS_RUNNING_APP_PARTITION(slot2_partition)
+#define ACTIVE_IMAGE_IS 1
+#elif FIXED_PARTITION_EXISTS(slot3_partition) &&			\
+	FIXED_PARTITION_IS_RUNNING_APP_PARTITION(slot3_partition)
+#define ACTIVE_IMAGE_IS 1
+#elif FIXED_PARTITION_EXISTS(slot4_partition) &&			\
+	FIXED_PARTITION_IS_RUNNING_APP_PARTITION(slot4_partition)
+#define ACTIVE_IMAGE_IS 2
+#elif FIXED_PARTITION_EXISTS(slot5_partition) &&			\
+	FIXED_PARTITION_IS_RUNNING_APP_PARTITION(slot5_partition)
+#define ACTIVE_IMAGE_IS 2
+#else
+#define ACTIVE_IMAGE_IS 0
 #endif
+#else
+#define ACTIVE_IMAGE_IS 0
 #endif
 
-#if !defined(NUMBER_OF_ACTIVE_IMAGE) && FIXED_PARTITION_EXISTS(slot1_partition)
-#if FIXED_PARTITION_IS_RUNNING_APP_PARTITION(slot1_partition)
-#define NUMBER_OF_ACTIVE_IMAGE 0
-#endif
-#endif
-
-#if !defined(NUMBER_OF_ACTIVE_IMAGE) && FIXED_PARTITION_EXISTS(slot2_partition)
-#if FIXED_PARTITION_IS_RUNNING_APP_PARTITION(slot2_partition)
-#define NUMBER_OF_ACTIVE_IMAGE 1
-#endif
-#endif
-
-#if !defined(NUMBER_OF_ACTIVE_IMAGE) && FIXED_PARTITION_EXISTS(slot3_partition)
-#if FIXED_PARTITION_IS_RUNNING_APP_PARTITION(slot3_partition)
-#define NUMBER_OF_ACTIVE_IMAGE 1
-#endif
-#endif
-
-#ifndef NUMBER_OF_ACTIVE_IMAGE
-#error "Unsupported code parition is set as active application partition"
-#endif
-
-_Static_assert(sizeof(struct image_header) == IMAGE_HEADER_SIZE,
-		"struct image_header not required size");
-
 LOG_MODULE_REGISTER(mcumgr_img_grp, CONFIG_MCUMGR_GRP_IMG_LOG_LEVEL);
 
 struct img_mgmt_state g_img_mgmt_state;
@@ -159,7 +154,7 @@ int img_mgmt_active_slot(int image)
 
 int img_mgmt_active_image(void)
 {
-	return NUMBER_OF_ACTIVE_IMAGE;
+	return ACTIVE_IMAGE_IS;
 }
 
 /*
diff --git a/subsys/mgmt/mcumgr/grp/img_mgmt/src/zephyr_img_mgmt.c b/subsys/mgmt/mcumgr/grp/img_mgmt/src/zephyr_img_mgmt.c
index c3641986fd2..addde1e9a2c 100644
--- a/subsys/mgmt/mcumgr/grp/img_mgmt/src/zephyr_img_mgmt.c
+++ b/subsys/mgmt/mcumgr/grp/img_mgmt/src/zephyr_img_mgmt.c
@@ -25,12 +25,26 @@ LOG_MODULE_DECLARE(mcumgr_img_grp, CONFIG_MCUMGR_GRP_IMG_LOG_LEVEL);
 #define SLOT1_PARTITION		slot1_partition
 #define SLOT2_PARTITION		slot2_partition
 #define SLOT3_PARTITION		slot3_partition
+#define SLOT4_PARTITION		slot4_partition
+#define SLOT5_PARTITION		slot5_partition
 
-BUILD_ASSERT(CONFIG_MCUMGR_GRP_IMG_UPDATABLE_IMAGE_NUMBER == 1 ||
-	     (CONFIG_MCUMGR_GRP_IMG_UPDATABLE_IMAGE_NUMBER == 2 &&
-	      FIXED_PARTITION_EXISTS(SLOT2_PARTITION) &&
-	      FIXED_PARTITION_EXISTS(SLOT3_PARTITION)),
+/* SLOT0_PARTITION and SLOT1_PARTITION are not checked because
+ * there is not conditional code that depends on them. If they do
+ * not exist compilation will fail, but in case if some of other
+ * partitions do not exist, code will compile and will not work
+ * properly.
+ */
+#if CONFIG_MCUMGR_GRP_IMG_UPDATABLE_IMAGE_NUMBER >= 2
+BUILD_ASSERT(FIXED_PARTITION_EXISTS(SLOT2_PARTITION) &&
+	     FIXED_PARTITION_EXISTS(SLOT3_PARTITION),
 	     "Missing partitions?");
+#endif
+
+#if CONFIG_MCUMGR_GRP_IMG_UPDATABLE_IMAGE_NUMBER == 3
+BUILD_ASSERT(FIXED_PARTITION_EXISTS(SLOT4_PARTITION) &&
+	     FIXED_PARTITION_EXISTS(SLOT5_PARTITION),
+	     "Missing partitions?");
+#endif
 
 /**
  * Determines if the specified area of flash is completely unwritten.
@@ -137,6 +151,18 @@ img_mgmt_flash_area_id(int slot)
 		break;
 #endif
 
+#if FIXED_PARTITION_EXISTS(SLOT4_PARTITION)
+	case 4:
+		fa_id = FIXED_PARTITION_ID(SLOT4_PARTITION);
+		break;
+#endif
+
+#if FIXED_PARTITION_EXISTS(SLOT5_PARTITION)
+	case 5:
+		fa_id = FIXED_PARTITION_ID(SLOT5_PARTITION);
+		break;
+#endif
+
 	default:
 		fa_id = -1;
 		break;
@@ -194,7 +220,7 @@ static int img_mgmt_get_unused_slot_area_id(int slot)
 	return slot != -1  ? img_mgmt_flash_area_id(slot) : -1;
 #endif
 }
-#elif CONFIG_MCUMGR_GRP_IMG_UPDATABLE_IMAGE_NUMBER == 2
+#elif CONFIG_MCUMGR_GRP_IMG_UPDATABLE_IMAGE_NUMBER >= 2
 static int img_mgmt_get_unused_slot_area_id(int image)
 {
 	int area_id = -1;