diff --git a/configuration_files/map_builder_server.lua b/configuration_files/map_builder_server.lua
index da965f1..b907eb2 100644
--- a/configuration_files/map_builder_server.lua
+++ b/configuration_files/map_builder_server.lua
@@ -14,10 +14,9 @@
 
 include "map_builder.lua"
 
-options = {
+MAP_BUILDER_SERVER = {
   server_address = "0.0.0.0:50051",
+  num_event_threads = 4,
   num_grpc_threads = 4,
   map_builder = MAP_BUILDER,
 }
-
-return options