diff --git a/include/mapnik/datasource_cache.hpp b/include/mapnik/datasource_cache.hpp
index 48493b762..4d9c41c78 100644
--- a/include/mapnik/datasource_cache.hpp
+++ b/include/mapnik/datasource_cache.hpp
@@ -35,7 +35,7 @@
 // stl
 #include <map>
 
-class lt__handle;
+struct lt__handle;
 
 namespace mapnik {