diff --git a/target/linux/ramips/image/Makefile b/target/linux/ramips/image/Makefile
index 5426226795..9cf64361a4 100644
--- a/target/linux/ramips/image/Makefile
+++ b/target/linux/ramips/image/Makefile
@@ -31,7 +31,7 @@ loadaddr-$(CONFIG_TARGET_ramips_mt7621) := 0x80001000
 
 KERNEL_LOADADDR := $(loadaddr-y)
 
-KERNEL_DTB = kernel-bin | patch-dtb | lzma -d21
+KERNEL_DTB = kernel-bin | patch-dtb | lzma
 define Device/Default
   PROFILES = Default $$(DTS)
   KERNEL_DEPENDS = $$(wildcard ../dts/$$(DTS).dts)
diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index 4195c22691..a4a0f3d293 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -2,6 +2,7 @@
 # MT7621 Profiles
 #
 
+KERNEL_DTB += -d21
 DEVICE_VARS += TPLINK_BOARD_ID TPLINK_HEADER_VERSION TPLINK_HWID TPLINK_HWREV
 
 define Build/elecom-gst-factory