diff --git a/include/mapnik/util/geometry_to_wkt.hpp b/include/mapnik/util/geometry_to_wkt.hpp
index e49423ece..5f6ca4bc6 100644
--- a/include/mapnik/util/geometry_to_wkt.hpp
+++ b/include/mapnik/util/geometry_to_wkt.hpp
@@ -24,34 +24,14 @@
 #define MAPNIK_GEOMETRY_TO_WKT_HPP
 
 // mapnik
-#include <mapnik/global.hpp>
+#include <mapnik/config.hpp>
 #include <mapnik/geometry.hpp>
-#include <mapnik/util/geometry_wkt_generator.hpp>
-
-// boost
-#include <boost/spirit/include/karma.hpp>
 
 namespace mapnik { namespace util {
 
-namespace karma = boost::spirit::karma;
+MAPNIK_DECL bool to_wkt(std::string & wkt, mapnik::geometry_type const& geom);
 
-bool to_wkt(std::string & wkt, mapnik::geometry_type const& geom)
-{
-    typedef std::back_insert_iterator<std::string> sink_type;
-    sink_type sink(wkt);
-    wkt_generator<sink_type, mapnik::geometry_type> generator(true);
-    bool result = karma::generate(sink, generator, geom);
-    return result;
-}
-
-bool to_wkt(std::string & wkt, mapnik::geometry_container const& geom)
-{
-    typedef std::back_insert_iterator<std::string> sink_type;
-    sink_type sink(wkt);
-    wkt_multi_generator<sink_type, mapnik::geometry_container> generator;
-    bool result = karma::generate(sink, generator, geom);
-    return result;
-}
+MAPNIK_DECL bool to_wkt(std::string & wkt, mapnik::geometry_container const& geom);
 
 }}
 
diff --git a/src/wkt/wkt_generator.cpp b/src/wkt/wkt_generator.cpp
index 03900ee4e..67ca61295 100644
--- a/src/wkt/wkt_generator.cpp
+++ b/src/wkt/wkt_generator.cpp
@@ -26,6 +26,7 @@
 
 #include <mapnik/geometry.hpp>
 #include <mapnik/util/geometry_wkt_generator.hpp>
+#include <mapnik/util/geometry_to_wkt.hpp>
 #include <mapnik/util/path_iterator.hpp>
 #include <mapnik/util/container_adapter.hpp>
 
@@ -156,6 +157,23 @@ wkt_multi_generator<OutputIterator, GeometryContainer>::wkt_multi_generator()
 template struct mapnik::util::wkt_generator<std::back_insert_iterator<std::string>, mapnik::geometry_type>;
 template struct mapnik::util::wkt_multi_generator<std::back_insert_iterator<std::string>, mapnik::geometry_container >;
 
+bool to_wkt(std::string & wkt, mapnik::geometry_type const& geom)
+{
+    typedef std::back_insert_iterator<std::string> sink_type;
+    sink_type sink(wkt);
+    wkt_generator<sink_type, mapnik::geometry_type> generator(true);
+    bool result = karma::generate(sink, generator, geom);
+    return result;
+}
+
+bool to_wkt(std::string & wkt, mapnik::geometry_container const& geom)
+{
+    typedef std::back_insert_iterator<std::string> sink_type;
+    sink_type sink(wkt);
+    wkt_multi_generator<sink_type, mapnik::geometry_container> generator;
+    bool result = karma::generate(sink, generator, geom);
+    return result;
+}
 
 }}