diff --git a/include/image.mk b/include/image.mk
index 01bc3bda86..87ba60d954 100644
--- a/include/image.mk
+++ b/include/image.mk
@@ -419,7 +419,7 @@ DEFAULT_DEVICE_VARS := \
   DEVICE_FDT_NUM DEVICE_IMG_PREFIX SOC BOARD_NAME UIMAGE_MAGIC UIMAGE_NAME \
   SUPPORTED_DEVICES IMAGE_METADATA KERNEL_ENTRY KERNEL_LOADADDR \
   UBOOT_PATH IMAGE_SIZE \
-  FACTORY_IMG_NAME \
+  FACTORY_IMG_NAME FACTORY_SIZE \
   DEVICE_PACKAGES DEVICE_COMPAT_VERSION DEVICE_COMPAT_MESSAGE \
   DEVICE_VENDOR DEVICE_MODEL DEVICE_VARIANT \
   DEVICE_ALT0_VENDOR DEVICE_ALT0_MODEL DEVICE_ALT0_VARIANT \