diff --git a/include/boost/thread/win32/recursive_mutex.hpp b/include/boost/thread/win32/recursive_mutex.hpp
index dea19dc1..5dff4be4 100644
--- a/include/boost/thread/win32/recursive_mutex.hpp
+++ b/include/boost/thread/win32/recursive_mutex.hpp
@@ -128,6 +128,10 @@ namespace boost
             
             void lock()
             {
+                if(locked())
+                {
+                    throw boost::lock_error();
+                }
                 m.lock();
                 is_locked=true;
             }
@@ -138,6 +142,10 @@ namespace boost
             }
             void unlock()
             {
+                if(!locked())
+                {
+                    throw boost::lock_error();
+                }
                 m.unlock();
                 is_locked=false;
             }
diff --git a/test/test_lock_concept.cpp b/test/test_lock_concept.cpp
index 7b8415ee..0f2f0298 100644
--- a/test/test_lock_concept.cpp
+++ b/test/test_lock_concept.cpp
@@ -135,8 +135,10 @@ boost::unit_test_framework::test_suite* init_unit_test_suite(int, char*[])
     add_tests_for_scoped_lock_concept<boost::mutex>(test);
     add_tests_for_scoped_lock_concept<boost::try_mutex>(test);
     add_tests_for_scoped_lock_concept<boost::recursive_mutex>(test);
+    add_tests_for_scoped_lock_concept<boost::recursive_try_mutex>(test);
 
     add_tests_for_scoped_try_lock_concept<boost::try_mutex>(test);
+    add_tests_for_scoped_try_lock_concept<boost::recursive_try_mutex>(test);
 
     return test;
 }