diff --git a/include/picrin/data.h b/include/picrin/data.h
index 84c2f580..a80ff209 100644
--- a/include/picrin/data.h
+++ b/include/picrin/data.h
@@ -24,6 +24,10 @@ struct pic_data {
 #define pic_data_p(o) (pic_type(o) == PIC_TT_DATA)
 #define pic_data_ptr(o) ((struct pic_data *)pic_ptr(o))
 
+static inline bool pic_data_type_p(const pic_value obj, const pic_data_type *type) {
+  return pic_data_p(obj) && pic_data_ptr(obj)->type == type;
+}
+
 struct pic_data *pic_data_alloc(pic_state *, const pic_data_type *, void *);
 
 #if defined(__cplusplus)