diff --git a/docker/backend/mempool-config.json b/docker/backend/mempool-config.json
index aefb095cf..8f69fd0c1 100644
--- a/docker/backend/mempool-config.json
+++ b/docker/backend/mempool-config.json
@@ -35,7 +35,7 @@
     "ALLOW_UNREACHABLE": __MEMPOOL_ALLOW_UNREACHABLE__,
     "POOLS_JSON_TREE_URL": "__MEMPOOL_POOLS_JSON_TREE_URL__",
     "POOLS_JSON_URL": "__MEMPOOL_POOLS_JSON_URL__",
-    "PRICE_UPDATES_PER_HOUR": __MEMPOOL_PRICE_UPDATES_PER_HOUR__
+    "PRICE_UPDATES_PER_HOUR": __MEMPOOL_PRICE_UPDATES_PER_HOUR__,
     "MAX_TRACKED_ADDRESSES": __MEMPOOL_MAX_TRACKED_ADDRESSES__
   },
   "CORE_RPC": {