diff --git a/src/intrusive_list.h b/src/intrusive_list.h
index c4050db9..005c1511 100644
--- a/src/intrusive_list.h
+++ b/src/intrusive_list.h
@@ -341,7 +341,7 @@ namespace etl
       const value_type* p_value;
     };
 
-		typedef typename std::iterator_traits<iterator>::difference_type difference_type;
+    typedef typename std::iterator_traits<iterator>::difference_type difference_type;
 
     //*************************************************************************
     /// Constructor.