diff --git a/installer/Dockerfile b/installer/Dockerfile
index c990f0afe..bc3d8a4b2 100644
--- a/installer/Dockerfile
+++ b/installer/Dockerfile
@@ -42,7 +42,7 @@ ENV MAXKB_VERSION="${DOCKER_IMAGE_TAG} (build at ${BUILD_AT}, commit: ${GITHUB_C
     MAXKB_DB_PASSWORD=Password123@postgres \
     MAXKB_EMBEDDING_MODEL_NAME=/opt/maxkb/model/embedding/shibing624_text2vec-base-chinese \
     MAXKB_EMBEDDING_MODEL_PATH=/opt/maxkb/model/embedding \
-    MAXKB_SANDBOX=true \
+    MAXKB_SANDBOX=1 \
     LANG=en_US.UTF-8 \
     PATH=/opt/py3/bin:$PATH \
     POSTGRES_USER=root \