diff --git a/luachild-scm-1.rockspec b/luachild-scm-1.rockspec
index 1405d6d..75a7efd 100644
--- a/luachild-scm-1.rockspec
+++ b/luachild-scm-1.rockspec
@@ -29,7 +29,7 @@ build = {
         ["luachild"] = {
           defines = { "USE_POSIX" },
           incdirs = { "./" },
-          sources = { "luachild_common.c", "luachild_lua_5_3.c", "luachild_luajit_2_1.c", "luachild_posix.c", "luachild_windows.c", }
+          sources = { "luachild_common.c", "luachild_lua_5_3.c", "luachild_lua_5_1.c", "luachild_luajit_2_1.c", "luachild_posix.c", "luachild_windows.c", }
         },
       },
     },
@@ -39,7 +39,7 @@ build = {
         ["luachild"] = {
           defines = { "USE_WINDOWS" },
           incdirs = { "./" },
-          sources = { "luachild_common.c", "luachild_lua_5_3.c", "luachild_luajit_2_1.c", "luachild_posix.c", "luachild_windows.c", }
+          sources = { "luachild_common.c", "luachild_lua_5_3.c", "luachild_lua_5_1.c", "luachild_luajit_2_1.c", "luachild_posix.c", "luachild_windows.c", }
         },
       },
     },
diff --git a/luachild_lua_5_1.c b/luachild_lua_5_1.c
index 2f42d3b..79703a3 100644
--- a/luachild_lua_5_1.c
+++ b/luachild_lua_5_1.c
@@ -1,5 +1,6 @@
 #include "luachild.h"
 #ifdef USE_LUAPUC
+#if LUA_VERSION_NUM == 501
 
 #include <stdio.h>
 #include <errno.h>
@@ -40,10 +41,16 @@ int file_handler_creator(lua_State *L, const char * file_path, int get_path_from
 
 void lua_pushcfile(lua_State *L, FILE * f){
   FILE **pf = (FILE **)lua_newuserdata(L, sizeof(FILE *));
+  *pf = f;
   luaL_getmetatable(L, LUA_FILEHANDLE);
   lua_setmetatable(L, -2);
-  *pf = f;
+  // create and set an env table with a __close function field
+  lua_createtable(L, 0, 1);
+  lua_pushcfunction(L, file_close);
+  lua_setfield(L, -2, "__close");
+  lua_setfenv(L, -2);
 }
 
+#endif // LUA_VERSION_NUM == 501
 #endif // USE_LUAPUC
 
diff --git a/luachild_lua_5_3.c b/luachild_lua_5_3.c
index 6fdad50..7631c4c 100644
--- a/luachild_lua_5_3.c
+++ b/luachild_lua_5_3.c
@@ -1,5 +1,6 @@
 #include "luachild.h"
 #ifdef USE_LUAPUC
+#if LUA_VERSION_NUM >= 502
 
 #include <stdio.h>
 #include <errno.h>
@@ -46,5 +47,6 @@ void lua_pushcfile(lua_State *L, FILE * f){
   lf->closef = &file_close;
 }
 
+#endif // LUA_VERSION_NUM >= 502
 #endif // USE_LUAPUC