diff --git a/base/buffer_vector.hpp b/base/buffer_vector.hpp
index e618878ac8..70be9015b3 100644
--- a/base/buffer_vector.hpp
+++ b/base/buffer_vector.hpp
@@ -174,7 +174,7 @@ public:
     }
   }
 
-  template <typename IterT> void insert(T const * where, IterT beg, IterT end)
+  template <typename IterT> void insert(const_iterator where, IterT beg, IterT end)
   {
     ptrdiff_t const pos = where - data();
     ASSERT_GREATER_OR_EQUAL(pos, 0, ());