diff --git a/include/boost/geometry/algorithms/detail/equals/collect_vectors.hpp b/include/boost/geometry/algorithms/detail/equals/collect_vectors.hpp
index c81a8e13d..807848fa0 100644
--- a/include/boost/geometry/algorithms/detail/equals/collect_vectors.hpp
+++ b/include/boost/geometry/algorithms/detail/equals/collect_vectors.hpp
@@ -112,7 +112,7 @@ struct range_collect_vectors
             return;
         }
 
-        typedef boost::range_size<Collection>::type collection_size_t;
+        typedef typename boost::range_size<Collection>::type collection_size_t;
         collection_size_t c_old_size = boost::size(collection);
 
         typedef typename boost::range_iterator<Range const>::type iterator;