diff --git a/data/apps/simulation/rt_simulator.cfg b/data/apps/simulation/rt_simulator.cfg
index a17377d..b288e2a 100644
--- a/data/apps/simulation/rt_simulator.cfg
+++ b/data/apps/simulation/rt_simulator.cfg
@@ -64,7 +64,7 @@
         },
     },
     "accounting": {
-        "exch_acct": "COINBASE_AT"
+        "exch_acct": "COINBASE_AT",
         "api": {
             "REST": {
                 "port": @env{SIM_ACCOUNTING_REST_PORT},