diff --git a/backend/mempool-config.sample.json b/backend/mempool-config.sample.json
index 2f27dab6a..040126154 100644
--- a/backend/mempool-config.sample.json
+++ b/backend/mempool-config.sample.json
@@ -60,7 +60,7 @@
     "REQUEST_TIMEOUT": 10000,
     "FALLBACK_TIMEOUT": 5000,
     "FALLBACK": [],
-    "MAX_BEHIND_TIP": 2,
+    "MAX_BEHIND_TIP": 2
   },
   "SECOND_CORE_RPC": {
     "HOST": "127.0.0.1",