diff --git a/eclass/nas-kernel.eclass b/eclass/nas-kernel.eclass
index 57f020a..9e0b5fb 100644
--- a/eclass/nas-kernel.eclass
+++ b/eclass/nas-kernel.eclass
@@ -360,6 +360,8 @@ nas-kernel_src_unpack() {
 		sed -i "s:^SUBLEVEL = .*:SUBLEVEL = ${K_NASKERNEL_FORCE_SUBLEVEL}:" \
 			"${S}/Makefile" || die
 	fi
+	#comment out Extra verion change by CK patch
+	sed -i -e 's/\(^EXTRAVERSION :=.*$\)/# \1/' "${S}/Makefile"
 	if [ -n "${K_NASKERNEL_RESET_EXTRAVERSION}" ]; then
 		sed -i "s:^EXTRAVERSION =.*:EXTRAVERSION = :" "${S}/Makefile" || die
 		# some sources could have multiple append-based EXTRAVERSIONs