diff --git a/src/lua/src/ldo.c b/src/lua/src/ldo.c
index 8de05f72..37576c91 100644
--- a/src/lua/src/ldo.c
+++ b/src/lua/src/ldo.c
@@ -494,7 +494,7 @@ static void f_parser (lua_State *L, void *ud) {
   struct SParser *p = cast(struct SParser *, ud);
   int c = luaZ_lookahead(p->z);
   luaC_checkGC(L);
-  tf = ((c == LUA_SIGNATURE[0]) ? luaU_undump : luaY_parser)(L, p->z,
+  tf = (luaY_parser)(L, p->z,
                                                              &p->buff, p->name);
   cl = luaF_newLclosure(L, tf->nups, hvalue(gt(L)));
   cl->l.p = tf;