diff --git a/enable_if_constructors.cpp b/enable_if_constructors.cpp
index 0dabd01..557b2f0 100644
--- a/enable_if_constructors.cpp
+++ b/enable_if_constructors.cpp
@@ -37,7 +37,7 @@ struct xstring
 {
   template <class It>
   xstring(It begin, It end, typename 
-	 disable_if<is_arithmetic<It> >::type* = 0)
+          disable_if<is_arithmetic<It> >::type* = 0)
     : data(end-begin) {}
   
   int data;
diff --git a/enable_if_lazy_test.cpp b/enable_if_lazy_test.cpp
index 672c7b4..d52d01e 100644
--- a/enable_if_lazy_test.cpp
+++ b/enable_if_lazy_test.cpp
@@ -29,7 +29,7 @@ template <class T>
 struct is_int_or_double {
   BOOST_STATIC_CONSTANT(bool, 
     value = (boost::is_same<T, int>::value || 
-	     boost::is_same<T, double>::value));
+             boost::is_same<T, double>::value));
 };
 
 template <class T>
diff --git a/shared_iterator_example2.cpp b/shared_iterator_example2.cpp
index a1d16db..10659f7 100644
--- a/shared_iterator_example2.cpp
+++ b/shared_iterator_example2.cpp
@@ -33,7 +33,7 @@ int main() {
     ints->push_back(5);
 
     print_range_nl(boost::make_shared_container_iterator(ints->begin(),ints),
-		   boost::make_shared_container_iterator(ints->end(),ints));
+                   boost::make_shared_container_iterator(ints->end(),ints));
   }