diff --git a/include/boost/detail/lightweight_mutex.hpp b/include/boost/detail/lightweight_mutex.hpp
index 9f80b00..d4ef1c1 100644
--- a/include/boost/detail/lightweight_mutex.hpp
+++ b/include/boost/detail/lightweight_mutex.hpp
@@ -38,8 +38,8 @@
 #  include <boost/detail/lwm_nop.hpp>
 #elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
 #  include <boost/detail/lwm_win32.hpp>
-//#elif defined(linux) || defined(__linux) || defined(__linux__)
-//#  include <boost/detail/lwm_linux.hpp>
+#elif defined(linux) || defined(__linux) || defined(__linux__)
+#  include <boost/detail/lwm_linux.hpp>
 #elif defined(BOOST_HAS_PTHREADS)
 #  include <boost/detail/lwm_pthreads.hpp>
 #else
diff --git a/include/boost/detail/lwm_linux.hpp b/include/boost/detail/lwm_linux.hpp
index c2ef69a..f502d60 100644
--- a/include/boost/detail/lwm_linux.hpp
+++ b/include/boost/detail/lwm_linux.hpp
@@ -17,6 +17,7 @@
 //
 
 #include <asm/atomic.h>
+#include <sched.h>
 
 namespace boost
 {
@@ -60,7 +61,7 @@ public:
             while( !atomic_dec_and_test(&m_.a_) )
             {
                 atomic_inc(&m_.a_);
-                // sched_yield();
+                sched_yield();
             }
         }