diff --git a/include/boost/geometry/algorithms/detail/buffer/buffer_inserter.hpp b/include/boost/geometry/algorithms/detail/buffer/buffer_inserter.hpp
index d3f2aeebc..1ed549bc0 100644
--- a/include/boost/geometry/algorithms/detail/buffer/buffer_inserter.hpp
+++ b/include/boost/geometry/algorithms/detail/buffer/buffer_inserter.hpp
@@ -576,7 +576,7 @@ struct buffer_inserter<linestring_tag, Linestring, Polygon>
             SideStrategy const& side_strategy,
             JoinStrategy const& join_strategy,
             EndStrategy const& end_strategy,
-            PointStrategy const& point_strategy,
+            PointStrategy const& ,
             RobustPolicy const& robust_policy)
     {
         if (boost::size(linestring) > 1)
diff --git a/include/boost/geometry/algorithms/detail/buffer/buffered_piece_collection.hpp b/include/boost/geometry/algorithms/detail/buffer/buffered_piece_collection.hpp
index 39b9d0e3f..216b17143 100644
--- a/include/boost/geometry/algorithms/detail/buffer/buffered_piece_collection.hpp
+++ b/include/boost/geometry/algorithms/detail/buffer/buffered_piece_collection.hpp
@@ -573,7 +573,7 @@ struct buffered_piece_collection
     inline void finish_ring()
     {
         BOOST_ASSERT(m_first_piece_index != -1);
-        if (m_first_piece_index < boost::size(m_pieces))
+        if (m_first_piece_index < static_cast<int>(boost::size(m_pieces)))
         {
             // If piece was added
             // Reassign left-of-first and right-of-last