diff --git a/include/msgpack/unpack.h b/include/msgpack/unpack.h
index 0f9aede2..036d575e 100644
--- a/include/msgpack/unpack.h
+++ b/include/msgpack/unpack.h
@@ -146,6 +146,18 @@ static inline void   msgpack_unpacker_buffer_consumed(msgpack_unpacker* mpac, si
 MSGPACK_DLLEXPORT
 msgpack_unpack_return msgpack_unpacker_next(msgpack_unpacker* mpac, msgpack_unpacked* pac);
 
+/**
+ * Deserializes one object and set the number of parsed bytes involved.
+ * Returns true if it successes. Otherwise false is returned.
+ * @param mpac    pointer to an initialized msgpack_unpacker object.
+ * @param result  pointer to an initialized msgpack_unpacked object.
+ * @param p_bytes pointer to variable that will be set with the number of parsed bytes.
+ */
+MSGPACK_DLLEXPORT
+msgpack_unpack_return msgpack_unpacker_next_with_size(msgpack_unpacker* mpac,
+                                                      msgpack_unpacked* result,
+                                                      size_t *p_bytes);
+
 /**
  * Initializes a msgpack_unpacked object.
  * The initialized object must be destroyed by msgpack_unpacked_destroy(msgpack_unpacker*).
@@ -267,4 +279,3 @@ static inline msgpack_zone* msgpack_unpacked_release_zone(msgpack_unpacked* resu
 #endif
 
 #endif /* msgpack/unpack.h */
-
diff --git a/src/unpack.c b/src/unpack.c
index 1bfcebbc..882b0b2c 100644
--- a/src/unpack.c
+++ b/src/unpack.c
@@ -510,7 +510,8 @@ void msgpack_unpacker_reset(msgpack_unpacker* mpac)
     mpac->parsed = 0;
 }
 
-msgpack_unpack_return msgpack_unpacker_next(msgpack_unpacker* mpac, msgpack_unpacked* result)
+static inline msgpack_unpack_return unpacker_next(msgpack_unpacker* mpac,
+                                                  msgpack_unpacked* result)
 {
     int ret;
 
@@ -529,11 +530,37 @@ msgpack_unpack_return msgpack_unpacker_next(msgpack_unpacker* mpac, msgpack_unpa
     }
     result->zone = msgpack_unpacker_release_zone(mpac);
     result->data = msgpack_unpacker_data(mpac);
-    msgpack_unpacker_reset(mpac);
 
     return MSGPACK_UNPACK_SUCCESS;
 }
 
+msgpack_unpack_return msgpack_unpacker_next(msgpack_unpacker* mpac,
+                                            msgpack_unpacked* result)
+{
+    int ret;
+
+    ret = unpacker_next(mpac, result);
+    if (ret == MSGPACK_UNPACK_SUCCESS) {
+        msgpack_unpacker_reset(mpac);
+    }
+
+    return ret;
+}
+
+msgpack_unpack_return
+msgpack_unpacker_next_with_size(msgpack_unpacker* mpac,
+                                msgpack_unpacked* result, size_t *p_bytes)
+{
+    int ret;
+
+    ret = unpacker_next(mpac, result);
+    if (ret == MSGPACK_UNPACK_SUCCESS) {
+        *p_bytes = mpac->parsed;
+        msgpack_unpacker_reset(mpac);
+    }
+
+    return ret;
+}
 
 msgpack_unpack_return
 msgpack_unpack(const char* data, size_t len, size_t* off,