diff --git a/include/image.mk b/include/image.mk
index fae4d32a8bb9..fde0e0ea4fd7 100644
--- a/include/image.mk
+++ b/include/image.mk
@@ -40,8 +40,10 @@ IMG_PREFIX_VERCODE:=$(if $(CONFIG_VERSION_CODE_FILENAMES),$(call sanitize,$(VERS
 IMG_PREFIX:=$(VERSION_DIST_SANITIZED)-$(IMG_PREFIX_VERNUM)$(IMG_PREFIX_VERCODE)$(IMG_PREFIX_EXTRA)$(BOARD)$(if $(SUBTARGET),-$(SUBTARGET))
 IMG_ROOTFS:=$(IMG_PREFIX)-rootfs
 IMG_COMBINED:=$(IMG_PREFIX)-combined
+ifeq ($(DUMP),)
 IMG_PART_SIGNATURE:=$(shell echo $(SOURCE_DATE_EPOCH)$(LINUX_VERMAGIC) | $(MKHASH) md5 | cut -b1-8)
 IMG_PART_DISKGUID:=$(shell echo $(SOURCE_DATE_EPOCH)$(LINUX_VERMAGIC) | $(MKHASH) md5 | sed -E 's/(.{8})(.{4})(.{4})(.{4})(.{10})../\1-\2-\3-\4-\500/')
+endif
 
 MKFS_DEVTABLE_OPT := -D $(INCLUDE_DIR)/device_table.txt
 
@@ -167,7 +169,9 @@ define Image/pad-to
 	mv $(1).new $(1)
 endef
 
+ifeq ($(DUMP),)
 ROOTFS_PARTSIZE=$(shell echo $$(($(CONFIG_TARGET_ROOTFS_PARTSIZE)*1024*1024)))
+endif
 
 define Image/pad-root-squashfs
 	$(call Image/pad-to,$(KDIR)/root.squashfs,$(if $(1),$(1),$(ROOTFS_PARTSIZE)))
diff --git a/target/linux/layerscape/image/Makefile b/target/linux/layerscape/image/Makefile
index 52dc532c34f2..bf6f33e5a026 100644
--- a/target/linux/layerscape/image/Makefile
+++ b/target/linux/layerscape/image/Makefile
@@ -8,8 +8,11 @@ include $(INCLUDE_DIR)/image.mk
 LS_SD_KERNELPART_SIZE = 40
 LS_SD_KERNELPART_OFFSET = 16
 LS_SD_ROOTFSPART_OFFSET = 64
+
+ifeq ($(DUMP),)
 LS_SD_IMAGE_SIZE = $(shell echo $$((($(LS_SD_ROOTFSPART_OFFSET) + \
 	$(CONFIG_TARGET_ROOTFS_PARTSIZE)))))
+endif
 
 # The limitation of flash sysupgrade.bin is 1MB dtb + 16MB kernel + 32MB rootfs
 LS_SYSUPGRADE_IMAGE_SIZE = 49m
diff --git a/target/linux/mediatek/image/filogic.mk b/target/linux/mediatek/image/filogic.mk
index 6323a05de2a6..9511fe052f51 100644
--- a/target/linux/mediatek/image/filogic.mk
+++ b/target/linux/mediatek/image/filogic.mk
@@ -130,7 +130,9 @@ define Device/bananapi_bpi-r3
 				   pad-to 64M | append-image squashfs-sysupgrade.itb | check-size |\
 				) \
 				  gzip
+ifeq ($(DUMP),)
   IMAGE_SIZE := $$(shell expr 64 + $$(CONFIG_TARGET_ROOTFS_PARTSIZE))m
+endif
   KERNEL			:= kernel-bin | gzip
   KERNEL_INITRAMFS := kernel-bin | lzma | \
 	fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb with-initrd | pad-to 64k
diff --git a/target/linux/mediatek/image/mt7622.mk b/target/linux/mediatek/image/mt7622.mk
index 040ef957db9a..e162a5df95bd 100644
--- a/target/linux/mediatek/image/mt7622.mk
+++ b/target/linux/mediatek/image/mt7622.mk
@@ -93,7 +93,9 @@ define Device/bananapi_bpi-r64
 				   pad-to 46080k | append-image squashfs-sysupgrade.itb | check-size |\
 				) \
 				  gzip
+ifeq ($(DUMP),)
   IMAGE_SIZE := $$(shell expr 45 + $$(CONFIG_TARGET_ROOTFS_PARTSIZE))m
+endif
   KERNEL			:= kernel-bin | gzip
   KERNEL_INITRAMFS		:= kernel-bin | lzma | fit lzma $$(DTS_DIR)/$$(DEVICE_DTS).dtb with-initrd | pad-to 128k
   IMAGE/sysupgrade.itb		:= append-kernel | fit gzip $$(DTS_DIR)/$$(DEVICE_DTS).dtb external-static-with-rootfs | append-metadata
diff --git a/target/linux/mediatek/image/mt7623.mk b/target/linux/mediatek/image/mt7623.mk
index 5828c4d763d9..2c4402da6619 100644
--- a/target/linux/mediatek/image/mt7623.mk
+++ b/target/linux/mediatek/image/mt7623.mk
@@ -96,7 +96,9 @@ define Device/bananapi_bpi-r2
   KERNEL := kernel-bin | gzip
   KERNEL_INITRAMFS_SUFFIX := -recovery.itb
   KERNEL_INITRAMFS := kernel-bin | gzip | fit gzip $$(DTS_DIR)/$$(DEVICE_DTS).dtb with-initrd
+ifeq ($(DUMP),)
   IMAGE_SIZE := $$(shell expr 48 + $$(CONFIG_TARGET_ROOTFS_PARTSIZE))m
+endif
   IMAGE/sysupgrade.itb := append-kernel | fit gzip $$(DTS_DIR)/$$(DEVICE_DTS).dtb external-static-with-rootfs | append-metadata
   ARTIFACT/preloader.bin := mt7623-mbr emmc |\
 			    pad-to 2k | append-preloader $$(UBOOT_TARGET)
@@ -130,7 +132,9 @@ define Device/unielec_u7623-02
   UBOOT_TARGET := mt7623a_unielec_u7623
   UBOOT_IMAGE := u-boot-mtk.bin
   UBOOT_PATH := $(STAGING_DIR_IMAGE)/$$(UBOOT_TARGET)-$$(UBOOT_IMAGE)
+ifeq ($(DUMP),)
   IMAGE_SIZE := $$(shell expr 48 + $$(CONFIG_TARGET_ROOTFS_PARTSIZE))m
+endif
   IMAGES := sysupgrade.itb
   KERNEL := kernel-bin | gzip
   KERNEL_INITRAMFS_SUFFIX := -recovery.itb
