diff --git a/target/linux/ipq40xx/image/Makefile b/target/linux/ipq40xx/image/Makefile
index 718caf340c..52c6c3e847 100644
--- a/target/linux/ipq40xx/image/Makefile
+++ b/target/linux/ipq40xx/image/Makefile
@@ -551,6 +551,7 @@ define Device/zyxel_nbg6617
 	DEVICE_VENDOR := ZyXEL
 	DEVICE_MODEL := NBG6617
 	DEVICE_DTS := qcom-ipq4018-nbg6617
+	KERNEL_SIZE := 4096k
 	ROOTFS_SIZE := 24960k
 	RAS_BOARD := NBG6617
 	RAS_ROOTFS_SIZE := 19840k