diff --git a/Dockerfile b/Dockerfile
index 72f3cc4..f4200c6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -138,7 +138,7 @@ RUN \
 
 RUN set -ex; \
   echo "Custom Applications"; \
-  export PHP_VERSION=$PHP_VERSION NODE_VERSION=$NODE_VERSION NODE_MANAGER=$NODE_MANAGER; \
+  export PHP_VERSION="${PHP_VERSION}" NODE_VERSION="${NODE_VERSION}" NODE_MANAGER="${NODE_MANAGER}"; \
   bash -c "$(curl -q -LSsf "https://github.com/templatemgr/nodejs/raw/main/install.sh")"; \
   echo ""