diff --git a/src/lib_debug.c b/src/lib_debug.c
index cda7137e..6628d943 100644
--- a/src/lib_debug.c
+++ b/src/lib_debug.c
@@ -283,13 +283,13 @@ LJLIB_CF(debug_setuservalue)
 
 /* ------------------------------------------------------------------------ */
 
-static const char KEY_HOOK = 'h';
+#define KEY_HOOK	((void *)0x3004)
 
 static void hookf(lua_State *L, lua_Debug *ar)
 {
   static const char *const hooknames[] =
     {"call", "return", "line", "count", "tail return"};
-  lua_pushlightuserdata(L, (void *)&KEY_HOOK);
+  lua_pushlightuserdata(L, KEY_HOOK);
   lua_rawget(L, LUA_REGISTRYINDEX);
   if (lua_isfunction(L, -1)) {
     lua_pushstring(L, hooknames[(int)ar->event]);
@@ -334,7 +334,7 @@ LJLIB_CF(debug_sethook)
     count = luaL_optint(L, arg+3, 0);
     func = hookf; mask = makemask(smask, count);
   }
-  lua_pushlightuserdata(L, (void *)&KEY_HOOK);
+  lua_pushlightuserdata(L, KEY_HOOK);
   lua_pushvalue(L, arg+1);
   lua_rawset(L, LUA_REGISTRYINDEX);
   lua_sethook(L, func, mask, count);
@@ -349,7 +349,7 @@ LJLIB_CF(debug_gethook)
   if (hook != NULL && hook != hookf) {  /* external hook? */
     lua_pushliteral(L, "external hook");
   } else {
-    lua_pushlightuserdata(L, (void *)&KEY_HOOK);
+    lua_pushlightuserdata(L, KEY_HOOK);
     lua_rawget(L, LUA_REGISTRYINDEX);   /* get hook */
   }
   lua_pushstring(L, unmakemask(mask, buff));
diff --git a/src/lib_package.c b/src/lib_package.c
index 8c336b02..898897b1 100644
--- a/src/lib_package.c
+++ b/src/lib_package.c
@@ -399,8 +399,7 @@ static int lj_cf_package_loader_preload(lua_State *L)
 
 /* ------------------------------------------------------------------------ */
 
-static const int sentinel_ = 0;
-#define sentinel	((void *)&sentinel_)
+#define sentinel	((void *)0x4004)
 
 static int lj_cf_package_require(lua_State *L)
 {