diff --git a/conf/machine/include/rockchip-defaults.inc b/conf/machine/include/rockchip-defaults.inc
index 0666119..905b2a6 100644
--- a/conf/machine/include/rockchip-defaults.inc
+++ b/conf/machine/include/rockchip-defaults.inc
@@ -3,7 +3,6 @@
 # kernel
 PREFERRED_PROVIDER_virtual/kernel ?= "linux-yocto"
 KCONFIG_MODE ?= "alldefconfig"
-LINUX_VERSION_EXTENSION ?= "-rockchip"
 
 # xserver
 PREFERRED_PROVIDER_virtual/xserver = "xserver-xorg"