diff --git a/include/boost/function/function_base.hpp b/include/boost/function/function_base.hpp
index eb201a8..fe9bbbe 100644
--- a/include/boost/function/function_base.hpp
+++ b/include/boost/function/function_base.hpp
@@ -264,12 +264,12 @@ namespace boost {
           A(a)
         {
         }
-	
-	functor_wrapper(const functor_wrapper& f) :
+        
+        functor_wrapper(const functor_wrapper& f) :
           F(static_cast<const F&>(f)),
           A(static_cast<const A&>(f))
-	{
-	}
+        {
+        }
       };
 
       /**