diff --git a/include/boost/range/iterator_range_core.hpp b/include/boost/range/iterator_range_core.hpp
old mode 100755
new mode 100644
index 7ef7523..faa0d6b
--- a/include/boost/range/iterator_range_core.hpp
+++ b/include/boost/range/iterator_range_core.hpp
@@ -231,7 +231,7 @@ namespace boost
 
             difference_type size() const
             {
-				return m_End - m_Begin;
+                return m_End - m_Begin;
             }
 
             bool empty() const