diff --git a/poky/meta/classes/kernel-grub.bbclass b/poky/meta/classes/kernel-grub.bbclass
index 5d92f3b..44b2015 100644
--- a/poky/meta/classes/kernel-grub.bbclass
+++ b/poky/meta/classes/kernel-grub.bbclass
@@ -99,7 +99,7 @@
         typelower = type.lower()
         preinst_append = preinst.replace('KERNEL_IMAGETYPE', type)
         postinst_prepend = postinst.replace('KERNEL_IMAGETYPE', type)
-        d.setVar('pkg_preinst_kernel-image-' + typelower + '_append', preinst_append)
-        d.setVar('pkg_postinst_kernel-image-' + typelower + '_prepend', postinst_prepend)
+        d.setVar('pkg_preinst:kernel-image-' + typelower + ':append', preinst_append)
+        d.setVar('pkg_postinst:kernel-image-' + typelower + ':prepend', postinst_prepend)
 }