diff --git a/src/lib_ffi.c b/src/lib_ffi.c
index cc8d419d..6eaec71c 100644
--- a/src/lib_ffi.c
+++ b/src/lib_ffi.c
@@ -743,7 +743,7 @@ 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) ||