diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index 9654e237a8a..27adb06bf7d 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -2860,7 +2860,7 @@ define Device/ubnt_edgerouter_common
   DEVICE_VENDOR := Ubiquiti
   IMAGE_SIZE := 256768k
   FILESYSTEMS := squashfs
-  KERNEL_SIZE := 3145728
+  KERNEL_SIZE := 6144k
   KERNEL_INITRAMFS := $$(KERNEL) | \
 	ubnt-erx-factory-image $(KDIR)/tmp/$$(KERNEL_INITRAMFS_PREFIX)-factory.tar
   IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata