diff --git a/include/mapnik/marker_cache.hpp b/include/mapnik/marker_cache.hpp
index 1d835d167..40cf8048f 100644
--- a/include/mapnik/marker_cache.hpp
+++ b/include/mapnik/marker_cache.hpp
@@ -46,7 +46,7 @@ class MAPNIK_DECL marker_cache :
 private:
     marker_cache();
     ~marker_cache();
-    bool insert_marker(std::string const& key, marker & path);
+    bool insert_marker(std::string const& key, marker && path);
     boost::unordered_map<std::string, mapnik::marker> marker_cache_;
     bool insert_svg(std::string const& name, std::string const& svg_string);
     boost::unordered_map<std::string,std::string> svg_cache_;
diff --git a/src/marker_cache.cpp b/src/marker_cache.cpp
index 7f4ba5cb9..e4daeb559 100644
--- a/src/marker_cache.cpp
+++ b/src/marker_cache.cpp
@@ -109,7 +109,7 @@ bool marker_cache::insert_svg(std::string const& name, std::string const& svg_st
     return false;
 }
 
-bool marker_cache::insert_marker(std::string const& uri, mapnik::marker & path)
+bool marker_cache::insert_marker(std::string const& uri, mapnik::marker && path)
 {
 #ifdef MAPNIK_THREADSAFE
     mapnik::scoped_lock lock(mutex_);