diff --git a/hack/build.sh b/hack/build.sh
index 7cfa7b46806..b88b4990ecf 100755
--- a/hack/build.sh
+++ b/hack/build.sh
@@ -2,6 +2,9 @@
 
 set -ex
 
+RELEASE_IMAGE="${RELEASE_IMAGE:-quay.io/openshift-release-dev/ocp-release:4.0.0-6}"
+RHCOS_BUILD_NAME="${RELEASE_BUILD_NAME:-47.212}"
+
 # shellcheck disable=SC2068
 version() { IFS="."; printf "%03d%03d%03d\\n" $@; unset IFS;}
 
diff --git a/pkg/asset/ignition/bootstrap/bootstrap.go b/pkg/asset/ignition/bootstrap/bootstrap.go
index 36312862ac1..2f59606088b 100644
--- a/pkg/asset/ignition/bootstrap/bootstrap.go
+++ b/pkg/asset/ignition/bootstrap/bootstrap.go
@@ -144,7 +144,7 @@ func (a *Bootstrap) getTemplateData(installConfig *types.InstallConfig) (*bootst
 	}
 
 	releaseImage := defaultReleaseImage
-	if ri, ok := os.LookupEnv("OPENSHIFT_INSTALL_RELEASE_IMAGE_OVERRIDE"); ok && ri != "" {
+	if ri, ok := os.LookupEnv("_OPENSHIFT_INSTALL_RELEASE_IMAGE_OVERRIDE"); ok && ri != "" {
 		logrus.Warn("Found override for ReleaseImage. Please be warned, this is not advised")
 		releaseImage = ri
 	}