diff --git a/include/boost/iterator/indirect_iterator.hpp b/include/boost/iterator/indirect_iterator.hpp
index 0839072..59babdf 100644
--- a/include/boost/iterator/indirect_iterator.hpp
+++ b/include/boost/iterator/indirect_iterator.hpp
@@ -35,7 +35,7 @@
 namespace boost
 {
   template <class Iter, class Value, class Category, class Reference, class Difference>
-  struct indirect_iterator;
+  class indirect_iterator;
 
   template <class T>
   struct referent;