diff --git a/Lib/lua/luarun.swg b/Lib/lua/luarun.swg
index 6ef2c6f15..1de9cc829 100644
--- a/Lib/lua/luarun.swg
+++ b/Lib/lua/luarun.swg
@@ -1796,7 +1796,7 @@ SWIGRUNTIME int  SWIG_Lua_ConvertPtr(lua_State *L,int index,void **ptr,swig_type
 
 SWIGRUNTIME void* SWIG_Lua_MustGetPtr(lua_State *L,int index,swig_type_info *type,int flags,
        int argnum,const char *func_name){
-  void *result;
+  void *result = 0;
   if (!SWIG_IsOK(SWIG_ConvertPtr(L,index,&result,type,flags))){
     luaL_error (L,"Error in %s, expected a %s at argument number %d\n",
 		func_name,(type && type->str)?type->str:"void*",argnum);