diff --git a/docker/init-docker b/docker/init-docker
index c95196c..8af15f8 100755
--- a/docker/init-docker
+++ b/docker/init-docker
@@ -100,7 +100,7 @@ if [ -r artisan -a -e ${php}/.env ]; then
 
 	# We only check for non mount points, in case this container has the app inside
 	mp=$(mp ${php})
-	if [ -n "${BUILD}" -o ${mp} -eq 0 ]; then
+	if [ -z "${BUILD}" -o ${mp} -eq 0 ]; then
 		echo "  - Caching configuration..."
 		CMD="php artisan optimize"
 		( [ -n "${USE_SU}" ] && su ${SITE_USER} -s /bin/sh -c "${CMD}" ) || ${CMD}