diff --git a/include/mapnik/wkt/wkt_grammar_x3_def.hpp b/include/mapnik/wkt/wkt_grammar_x3_def.hpp
index 54b4acfb5..be9bcd0c7 100644
--- a/include/mapnik/wkt/wkt_grammar_x3_def.hpp
+++ b/include/mapnik/wkt/wkt_grammar_x3_def.hpp
@@ -26,13 +26,16 @@
 #include <mapnik/wkt/wkt_grammar_x3.hpp>
 #include <mapnik/geometry/fusion_adapted.hpp>
 
-#if defined(__GNUC__) && BOOST_VERSION < 106300
-// instantiate `is_substitute` for reference T and reference Attribute
-// fixes gcc6 compilation issue with boost 1_61 and boost_1_62
+#if defined(__GNUC__)
+// instantiate `is_substitute` for const reference T and reference Attribute
+// fixes gcc6 compilation issue
 namespace boost { namespace spirit { namespace x3 { namespace traits {
-template <typename T, typename Attribute, typename Enable>
-struct is_substitute<T&, Attribute&, Enable>
-  : is_substitute<T, Attribute, Enable> {};
+
+using ring_type = mapnik::geometry::linear_ring<double>;
+template <>
+struct is_substitute<ring_type const&, ring_type const& , void>
+    : is_substitute<ring_type, ring_type, void>  {};
+
 }}}}
 #endif