diff --git a/target/linux/mvebu/image/Makefile b/target/linux/mvebu/image/Makefile
index f3eda17a0b..7900fb9ddb 100644
--- a/target/linux/mvebu/image/Makefile
+++ b/target/linux/mvebu/image/Makefile
@@ -141,7 +141,7 @@ define Device/openblocks-ax3
   DEVICE_DTS := armada-xp-openblocks-ax3-4
   BLOCKSIZE := 128k
   PAGESIZE := 1
-  IMAGE/factory.img := append-kernel $$$$(KERNEL_SIZE) | append-ubi
+  IMAGE/factory.img := append-kernel | pad-to $$(BLOCKSIZE) | append-ubi
   DEVICE_TITLE := Plat'Home OpenBlocks AX3
 endef
 TARGET_DEVICES += openblocks-ax3