diff --git a/src/script/cpp_api/s_env.cpp b/src/script/cpp_api/s_env.cpp
index 2fe7d8074..916c562fb 100644
--- a/src/script/cpp_api/s_env.cpp
+++ b/src/script/cpp_api/s_env.cpp
@@ -61,7 +61,7 @@ void ScriptApiEnv::environment_Step(float dtime)
 void ScriptApiEnv::player_event(ServerActiveObject* player, std::string type)
 {
 	SCRIPTAPI_PRECHECKHEADER
-	
+
 	if (player == NULL)
 		return;
 
@@ -82,28 +82,31 @@ void ScriptApiEnv::player_event(ServerActiveObject* player, std::string type)
 void ScriptApiEnv::environment_OnMapgenInit(MapgenParams *mgparams)
 {
 	SCRIPTAPI_PRECHECKHEADER
-	
+
 	// Get core.registered_on_mapgen_inits
 	lua_getglobal(L, "core");
 	lua_getfield(L, -1, "registered_on_mapgen_inits");
 
 	// Call callbacks
 	lua_newtable(L);
-	
+
 	lua_pushstring(L, mgparams->mg_name.c_str());
 	lua_setfield(L, -2, "mgname");
-	
+
 	lua_pushinteger(L, mgparams->seed);
 	lua_setfield(L, -2, "seed");
-	
+
 	lua_pushinteger(L, mgparams->water_level);
 	lua_setfield(L, -2, "water_level");
-	
+
+	lua_pushinteger(L, mgparams->chunksize);
+	lua_setfield(L, -2, "chunksize");
+
 	std::string flagstr = writeFlagString(mgparams->flags,
 		flagdesc_mapgen, (u32)-1);
 	lua_pushstring(L, flagstr.c_str());
 	lua_setfield(L, -2, "flags");
-	
+
 	script_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
 }