diff --git a/target/linux/ipq40xx/image/Makefile b/target/linux/ipq40xx/image/Makefile
index ef80e68393..a9c5e625af 100644
--- a/target/linux/ipq40xx/image/Makefile
+++ b/target/linux/ipq40xx/image/Makefile
@@ -124,7 +124,7 @@ define Device/avm_fritzbox-4040
 	DEVICE_MODEL := FRITZ!Box 4040
 	DEVICE_DTS := qcom-ipq4018-fritz4040
 	BOARD_NAME := fritz4040
-	IMAGE_SIZE := 29753344
+	IMAGE_SIZE := 29056k
 	UBOOT_PATH := $(STAGING_DIR_IMAGE)/uboot-fritz4040.bin
 	UBOOT_PARTITION_SIZE := 524288
 	IMAGES = eva.bin sysupgrade.bin
@@ -223,7 +223,7 @@ define Device/engenius_ens620ext
 	FW_VER := 3.1.2
 	FW_VER_NEW := 3.5.6
 	CW_VER := 1.8.99
-	IMAGE_SIZE := 21823488
+	IMAGE_SIZE := 21312k
 	KERNEL_SIZE := 5120k
 	FILESYSTEMS := squashfs
 	IMAGES := sysupgrade.bin factory_30.bin factory_35.bin
@@ -274,8 +274,8 @@ define Device/linksys_ea6350v3
 	DEVICE_DTS := qcom-ipq4018-ea6350v3
 	BLOCKSIZE := 128k
 	PAGESIZE := 2048
-	KERNEL_SIZE := 3145728
-	IMAGE_SIZE := 38797312
+	KERNEL_SIZE := 3072k
+	IMAGE_SIZE := 37888k
 	UBINIZE_OPTS := -E 5
 	IMAGES := factory.bin sysupgrade.bin
 	IMAGE/factory.bin := append-kernel | append-uImage-fakehdr filesystem | pad-to $$$${KERNEL_SIZE} | append-ubi | linksys-image type=EA6350v3
@@ -304,7 +304,7 @@ define Device/meraki_mr33
 	DEVICE_VENDOR := Cisco Meraki
 	DEVICE_MODEL := MR33
 	DEVICE_DTS := qcom-ipq4029-mr33
-	BLOCKSIZE := 131072
+	BLOCKSIZE := 128k
 	PAGESIZE := 2048
 	IMAGES = sysupgrade.bin
 	DEVICE_PACKAGES := -swconfig ath10k-firmware-qca9887-ct