diff --git a/src/unpack.c b/src/unpack.c
index 93a8d7c3..7af4e65d 100644
--- a/src/unpack.c
+++ b/src/unpack.c
@@ -492,6 +492,10 @@ void msgpack_unpacker_reset(msgpack_unpacker* mpac)
 
 msgpack_unpack_return msgpack_unpacker_next(msgpack_unpacker* mpac, msgpack_unpacked* result)
 {
+    if(result->zone != NULL) {
+        msgpack_zone_free(result->zone);
+    }
+
     int ret = msgpack_unpacker_execute(mpac);
 
     if(ret < 0) {