diff --git a/src/lib_ffi.c b/src/lib_ffi.c
index 2d942b23..989fddd3 100644
--- a/src/lib_ffi.c
+++ b/src/lib_ffi.c
@@ -137,6 +137,7 @@ static int ffi_index_meta(lua_State *L, CTState *cts, CType *ct, MMS mm)
 	return 0;
       }
     }
+    copyTV(L, base, L->top);
     tv = L->top-1;
   }
   return lj_meta_tailcall(L, tv);