diff --git a/include/boost/detail/shared_count.hpp b/include/boost/detail/shared_count.hpp
index 22a1e09..51df052 100644
--- a/include/boost/detail/shared_count.hpp
+++ b/include/boost/detail/shared_count.hpp
@@ -43,6 +43,10 @@ public:
 
 class counted_base
 {
+private:
+
+    typedef detail::lightweight_mutex mutex_type;
+
 public:
 
     // pre: initial_use_count <= initial_weak_count
@@ -72,7 +76,7 @@ public:
     void add_ref()
     {
 #ifdef BOOST_HAS_THREADS
-        lightweight_mutex::scoped_lock lock(mtx_);
+        mutex_type::scoped_lock lock(mtx_);
 #endif
         if(use_count_ == 0 && weak_count_ != 0) throw use_count_is_zero();
         ++use_count_;
@@ -86,7 +90,7 @@ public:
 
         {
 #ifdef BOOST_HAS_THREADS
-            lightweight_mutex::scoped_lock lock(mtx_);
+            mutex_type::scoped_lock lock(mtx_);
 #endif
             new_use_count = --use_count_;
             new_weak_count = --weak_count_;
@@ -108,7 +112,7 @@ public:
     void weak_add_ref() // nothrow
     {
 #ifdef BOOST_HAS_THREADS
-        lightweight_mutex::scoped_lock lock(mtx_);
+        mutex_type::scoped_lock lock(mtx_);
 #endif
         ++weak_count_;
     }
@@ -119,7 +123,7 @@ public:
 
         {
 #ifdef BOOST_HAS_THREADS
-            lightweight_mutex::scoped_lock lock(mtx_);
+            mutex_type::scoped_lock lock(mtx_);
 #endif
             new_weak_count = --weak_count_;
         }
@@ -133,7 +137,7 @@ public:
     long use_count() const // nothrow
     {
 #ifdef BOOST_HAS_THREADS
-        lightweight_mutex::scoped_lock lock(mtx_);
+        mutex_type::scoped_lock lock(mtx_);
 #endif
         return use_count_;
     }
@@ -153,7 +157,7 @@ private:
     long use_count_;
     long weak_count_;
 #ifdef BOOST_HAS_THREADS
-    mutable lightweight_mutex mtx_;
+    mutable mutex_type mtx_;
 #endif
     void (*self_deleter_) (counted_base *);
 };
diff --git a/include/boost/intrusive_ptr.hpp b/include/boost/intrusive_ptr.hpp
index 1d5349a..87dbece 100644
--- a/include/boost/intrusive_ptr.hpp
+++ b/include/boost/intrusive_ptr.hpp
@@ -17,7 +17,7 @@
 #ifdef BOOST_MSVC  // moved here to work around VC++ compiler crash
 # pragma warning(push)
 # pragma warning(disable:4284) // odd return type for operator->
-#endif    
+#endif
 
 #include <functional> // std::less
 
diff --git a/include/boost/weak_ptr.hpp b/include/boost/weak_ptr.hpp
index 01c248c..e04b4f1 100644
--- a/include/boost/weak_ptr.hpp
+++ b/include/boost/weak_ptr.hpp
@@ -19,7 +19,7 @@
 #ifdef BOOST_MSVC  // moved here to work around VC++ compiler crash
 # pragma warning(push)
 # pragma warning(disable:4284) // odd return type for operator->
-#endif    
+#endif
 
 namespace boost
 {