diff --git a/target/linux/ar71xx/image/generic.mk b/target/linux/ar71xx/image/generic.mk
index 726b03a04c..3352d156ac 100644
--- a/target/linux/ar71xx/image/generic.mk
+++ b/target/linux/ar71xx/image/generic.mk
@@ -874,6 +874,9 @@ define Device/wpj344
   $(Device/wpj-16m)
   DEVICE_TITLE := Compex WPJ344 (16MB flash)
   BOARDNAME := WPJ344
+  SUPPORTED_DEVICES := wpj344
+  IMAGE/sysupgrade.bin := append-kernel | pad-to $$$$(BLOCKSIZE) | \
+	append-rootfs | pad-rootfs | append-metadata | check-size $$$$(IMAGE_SIZE)
 endef
 
 define Device/wpj531
@@ -886,6 +889,9 @@ define Device/wpj558
   $(Device/wpj-16m)
   DEVICE_TITLE := Compex WPJ558 (16MB flash)
   BOARDNAME := WPJ558
+  SUPPORTED_DEVICES := wpj558
+  IMAGE/sysupgrade.bin := append-kernel | pad-to $$$$(BLOCKSIZE) | \
+	append-rootfs | pad-rootfs | append-metadata | check-size $$$$(IMAGE_SIZE)
 endef
 
 define Device/wpj563