diff --git a/include/boost/iterator/reverse_iterator.hpp b/include/boost/iterator/reverse_iterator.hpp
index 8446f23..03b7925 100644
--- a/include/boost/iterator/reverse_iterator.hpp
+++ b/include/boost/iterator/reverse_iterator.hpp
@@ -50,7 +50,7 @@ namespace iterators {
 
       void advance(typename super_t::difference_type n)
       {
-          this->base_reference() += -n;
+          this->base_reference() -= n;
       }
 
       template <class OtherIterator>