diff --git a/docker/backend/mempool-config.json b/docker/backend/mempool-config.json
index e283d1171..aa084133f 100644
--- a/docker/backend/mempool-config.json
+++ b/docker/backend/mempool-config.json
@@ -52,7 +52,7 @@
     "REST_API_URL": "__ESPLORA_REST_API_URL__",
     "UNIX_SOCKET_PATH": "__ESPLORA_UNIX_SOCKET_PATH__",
     "RETRY_UNIX_SOCKET_AFTER": __ESPLORA_RETRY_UNIX_SOCKET_AFTER__,
-    "FALLBACK": __ESPLORA_FALLBACK__,
+    "FALLBACK": __ESPLORA_FALLBACK__
   },
   "SECOND_CORE_RPC": {
     "HOST": "__SECOND_CORE_RPC_HOST__",