diff --git a/include/boost/thread/detail/read_write_scheduling_policy.hpp b/include/boost/thread/detail/read_write_scheduling_policy.hpp
index 323353df..f15598d7 100644
--- a/include/boost/thread/detail/read_write_scheduling_policy.hpp
+++ b/include/boost/thread/detail/read_write_scheduling_policy.hpp
@@ -18,7 +18,8 @@ namespace boost
             writer_priority,
             reader_priority,
             alternating_many_reads,
-            alternating_single_read
+            alternating_single_read,
+            unspecified=writer_priority
         };
     }
 }
diff --git a/test/test_read_write_mutex.cpp b/test/test_read_write_mutex.cpp
index 835f85fa..3ba9f96f 100644
--- a/test/test_read_write_mutex.cpp
+++ b/test/test_read_write_mutex.cpp
@@ -834,7 +834,7 @@ void test_multiple_readers()
     
     boost::thread_group pool;
 
-    boost::read_write_mutex rw_mutex;
+    boost::read_write_mutex rw_mutex(::boost::read_write_scheduling_policy::unspecified);
     unsigned unblocked_count=0;
     boost::mutex unblocked_count_mutex;
     boost::mutex finish_mutex;
@@ -858,7 +858,7 @@ void test_reader_blocks_writer()
 {
     boost::thread_group pool;
 
-    boost::read_write_mutex rw_mutex;
+    boost::read_write_mutex rw_mutex(::boost::read_write_scheduling_policy::unspecified);
     unsigned unblocked_count=0;
     boost::mutex unblocked_count_mutex;
     boost::mutex finish_mutex;
@@ -884,7 +884,7 @@ void test_only_one_writer_permitted()
     
     boost::thread_group pool;
 
-    boost::read_write_mutex rw_mutex;
+    boost::read_write_mutex rw_mutex(::boost::read_write_scheduling_policy::unspecified);
     unsigned unblocked_count=0;
     boost::mutex unblocked_count_mutex;
     boost::mutex finish_mutex;
@@ -910,7 +910,7 @@ void test_unlocking_writer_unblocks_all_readers()
 {
     boost::thread_group pool;
 
-    boost::read_write_mutex rw_mutex;
+    boost::read_write_mutex rw_mutex(::boost::read_write_scheduling_policy::unspecified);
     boost::read_write_mutex::scoped_write_lock write_lock(rw_mutex);
     unsigned unblocked_count=0;
     boost::mutex unblocked_count_mutex;
@@ -939,7 +939,7 @@ void test_unlocking_last_reader_only_unblocks_one_writer()
 {
     boost::thread_group pool;
 
-    boost::read_write_mutex rw_mutex;
+    boost::read_write_mutex rw_mutex(::boost::read_write_scheduling_policy::unspecified);
     unsigned unblocked_count=0;
     boost::mutex unblocked_count_mutex;
     boost::mutex finish_reading_mutex;