diff --git a/src/lib_ffi.c b/src/lib_ffi.c
index ac2b2742..2295cf15 100644
--- a/src/lib_ffi.c
+++ b/src/lib_ffi.c
@@ -639,7 +639,7 @@ LJLIB_CF(ffi_alignof)	LJLIB_REC(ffi_xof FF_ffi_alignof)
   CTState *cts = ctype_cts(L);
   CTypeID id = ffi_checkctype(L, cts, NULL);
   CTSize sz = 0;
-  CTInfo info = lj_ctype_info(cts, id, &sz);
+  CTInfo info = lj_ctype_info_raw(cts, id, &sz);
   setintV(L->top-1, 1 << ctype_align(info));
   return 1;
 }
@@ -770,7 +770,7 @@ LJLIB_CF(ffi_metatype)
   CTypeID id = ffi_checkctype(L, cts, NULL);
   GCtab *mt = lj_lib_checktab(L, 2);
   GCtab *t = cts->miscmap;
-  CType *ct = ctype_get(cts, id);  /* Only allow raw types. */
+  CType *ct = ctype_raw(cts, id);
   TValue *tv;
   GCcdata *cd;
   if (!(ctype_isstruct(ct->info) || ctype_iscomplex(ct->info) ||
diff --git a/src/lj_cparse.c b/src/lj_cparse.c
index e364939d..7fd83997 100644
--- a/src/lj_cparse.c
+++ b/src/lj_cparse.c
@@ -468,7 +468,7 @@ 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;
diff --git a/src/lj_ctype.c b/src/lj_ctype.c
index 4655eee7..204be034 100644
--- a/src/lj_ctype.c
+++ b/src/lj_ctype.c
@@ -333,6 +333,14 @@ CTInfo lj_ctype_info(CTState *cts, CTypeID id, CTSize *szp)
   return qual;
 }
 
+/* Ditto, but follow a reference. */
+CTInfo lj_ctype_info_raw(CTState *cts, CTypeID id, CTSize *szp)
+{
+  CType *ct = ctype_get(cts, id);
+  if (ctype_isref(ct->info)) id = ctype_cid(ct->info);
+  return lj_ctype_info(cts, id, szp);
+}
+
 /* Get ctype metamethod. */
 cTValue *lj_ctype_meta(CTState *cts, CTypeID id, MMS mm)
 {
diff --git a/src/lj_ctype.h b/src/lj_ctype.h
index 2473b57e..3dbcdbfb 100644
--- a/src/lj_ctype.h
+++ b/src/lj_ctype.h
@@ -468,6 +468,7 @@ LJ_FUNC CType *lj_ctype_rawref(CTState *cts, CTypeID id);
 LJ_FUNC CTSize lj_ctype_size(CTState *cts, CTypeID id);
 LJ_FUNC CTSize lj_ctype_vlsize(CTState *cts, CType *ct, CTSize nelem);
 LJ_FUNC CTInfo lj_ctype_info(CTState *cts, CTypeID id, CTSize *szp);
+LJ_FUNC CTInfo lj_ctype_info_raw(CTState *cts, CTypeID id, CTSize *szp);
 LJ_FUNC cTValue *lj_ctype_meta(CTState *cts, CTypeID id, MMS mm);
 LJ_FUNC GCstr *lj_ctype_repr(lua_State *L, CTypeID id, GCstr *name);
 LJ_FUNC GCstr *lj_ctype_repr_int64(lua_State *L, uint64_t n, int isunsigned);