diff --git a/src/pre_generated-zmq.nobj.c b/src/pre_generated-zmq.nobj.c
index 39e247d..d3d6544 100644
--- a/src/pre_generated-zmq.nobj.c
+++ b/src/pre_generated-zmq.nobj.c
@@ -3115,7 +3115,7 @@ static const char *zmq_ffi_lua_code[] = { "local ffi=require\"ffi\"\n"
 "\n"
 "-- method: init\n"
 "function _M.init(io_threads1)\n"
-"  \n"
+"    io_threads1 = io_threads1 or 1\n"
 "  local rc_zmq_init_flags1 = OBJ_UDATA_FLAG_OWN\n"
 "  local rc_zmq_init1\n"
 "  rc_zmq_init1 = C.zmq_init(io_threads1)\n"
@@ -5643,7 +5643,7 @@ static int zmq__version__func(lua_State *L) {
 
 /* method: init */
 static int zmq__init__func(lua_State *L) {
-  int io_threads1 = luaL_checkinteger(L,1);
+  int io_threads1 = luaL_optinteger(L,1,1);
   int rc_zmq_init_flags1 = OBJ_UDATA_FLAG_OWN;
   ZMQ_Ctx * rc_zmq_init1;
   rc_zmq_init1 = zmq_init(io_threads1);
diff --git a/zmq.nobj.lua b/zmq.nobj.lua
index 8d72f04..029b231 100644
--- a/zmq.nobj.lua
+++ b/zmq.nobj.lua
@@ -199,6 +199,7 @@ c_function "version" {
 ]],
 },
 c_function "init" {
+	var_in{ "int", "io_threads?", default = "1" },
 	c_call "!ZMQ_Ctx *" "zmq_init" { "int", "io_threads" },
 },
 c_function "init_ctx" {