diff --git a/sdk_container/src/third_party/portage-stable/eclass/selinux-policy-2.eclass b/sdk_container/src/third_party/portage-stable/eclass/selinux-policy-2.eclass
index e7d6cd9a9e..e8b7ef863a 100644
--- a/sdk_container/src/third_party/portage-stable/eclass/selinux-policy-2.eclass
+++ b/sdk_container/src/third_party/portage-stable/eclass/selinux-policy-2.eclass
@@ -23,7 +23,7 @@ case ${EAPI} in
 	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
 esac
 
-if [[ ! ${_SELINUX_POLICY_2_ECLASS} ]]; then
+if [[ -z ${_SELINUX_POLICY_2_ECLASS} ]]; then
 _SELINUX_POLICY_2_ECLASS=1
 
 # @ECLASS_VARIABLE: MODS