diff --git a/docker/scripts/merge_env.py b/docker/scripts/merge_env.py
index 73dcc4c6a..9a328b00c 100644
--- a/docker/scripts/merge_env.py
+++ b/docker/scripts/merge_env.py
@@ -10,7 +10,10 @@
 #
 import sys
 
-PREFERRED_BASE_ENV_KEYS = []
+PREFERRED_BASE_ENV_KEYS = [
+    "STRUCTURE_TOOL_IMAGE_URL",
+    "STRUCTURE_TOOL_IMAGE_TAG",
+]
 DEFAULT_AUTH_KEY = "unstract"
 DEFAULT_ADMIN_KEY = "admin"
 SET_DEFAULT_KEYS = {