diff --git a/index/test/rtree/rtree_non_cartesian.cpp b/index/test/rtree/rtree_non_cartesian.cpp
index 6111a2847..cbc4f633a 100644
--- a/index/test/rtree/rtree_non_cartesian.cpp
+++ b/index/test/rtree/rtree_non_cartesian.cpp
@@ -3,6 +3,10 @@
 
 // Copyright (c) 2016 Adam Wulkiewicz, Lodz, Poland.
 
+// This file was modified by Oracle on 2021.
+// Modifications copyright (c) 2021, Oracle and/or its affiliates.
+// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
+
 // Use, modification and distribution is subject to the Boost Software License,
 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
 // http://www.boost.org/LICENSE_1_0.txt)
@@ -101,7 +105,7 @@ void test_ticket_12413()
 
     size_t num_removed = rtree.remove(std::make_pair(point_t(-0.127592, 51.503407), 796));
 
-    BOOST_CHECK_EQUAL(num_removed, 1);
+    BOOST_CHECK_EQUAL(num_removed, 1u);
 }
 
 template <typename Point>