diff --git a/sdk_container/src/third_party/coreos-overlay/app-emulation/rkt/rkt-9999.ebuild b/sdk_container/src/third_party/coreos-overlay/app-emulation/rkt/rkt-9999.ebuild
index 7b0e9c5b0d..84564aecf2 100644
--- a/sdk_container/src/third_party/coreos-overlay/app-emulation/rkt/rkt-9999.ebuild
+++ b/sdk_container/src/third_party/coreos-overlay/app-emulation/rkt/rkt-9999.ebuild
@@ -77,7 +77,7 @@ src_prepare() {
 
 	rkt_coreos_version=$(awk '/^CCN_IMG_RELEASE/ { print $3 }' stage1/usr_from_coreos/coreos-common.mk)
 	if [ "${rkt_coreos_version}" != "${PXE_VERSION}" ]; then
-		die "CoreOS versions in ebuild and rkt build scripts are mismatched expecting ${rkt_stage1_coreos}!"
+		die "CoreOS versions in ebuild and rkt build scripts are mismatched, expecting ${rkt_coreos_version}!"
 	fi
 
 	autotools-utils_src_prepare