diff --git a/src/lib/iter-adapter.hpp b/src/lib/iter-adapter.hpp
index 96c92345c..1b024c912 100644
--- a/src/lib/iter-adapter.hpp
+++ b/src/lib/iter-adapter.hpp
@@ -539,7 +539,7 @@ namespace lib {
     public:
       typedef const INT* pointer;
       typedef const INT& reference;
-      typedef const INT  value_type;
+      typedef       INT  value_type;
       
       NumIter (INT start, INT end)
         : i_(start)