diff --git a/poky/meta-skeleton/recipes-kernel/linux/linux-yocto-custom.bb b/poky/meta-skeleton/recipes-kernel/linux/linux-yocto-custom.bb
index d53f9c7..6062f84 100644
--- a/poky/meta-skeleton/recipes-kernel/linux/linux-yocto-custom.bb
+++ b/poky/meta-skeleton/recipes-kernel/linux/linux-yocto-custom.bb
@@ -57,7 +57,7 @@
 SRC_URI = "git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git;protocol=git;nocheckout=1;name=machine"
 
 LINUX_VERSION ?= "4.2"
-LINUX_VERSION_EXTENSION_append = "-custom"
+LINUX_VERSION_EXTENSION:append = "-custom"
 
 # Modify SRCREV to a different commit hash in a copy of this recipe to
 # build a different release of the Linux kernel.