diff --git a/src/lj_cparse.c b/src/lj_cparse.c
index 9cd26d67..df85d23b 100644
--- a/src/lj_cparse.c
+++ b/src/lj_cparse.c
@@ -457,7 +457,7 @@ static void cp_expr_sizeof(CPState *cp, CPValue *k, int wantsz)
   } else {
     cp_expr_unary(cp, k);
   }
-  info = lj_ctype_info(cp->cts, k->id, &sz);
+  info = lj_ctype_info_raw(cp->cts, k->id, &sz);
   if (wantsz) {
     if (sz != CTSIZE_INVALID)
       k->u32 = sz;