diff --git a/include/boost/thread/detail/thread.hpp b/include/boost/thread/detail/thread.hpp
index 2f6c1581..019d0d73 100644
--- a/include/boost/thread/detail/thread.hpp
+++ b/include/boost/thread/detail/thread.hpp
@@ -546,9 +546,7 @@ namespace boost
         void detach();
 
         static unsigned hardware_concurrency() BOOST_NOEXCEPT;
-#ifdef BOOST_THREAD_PROVIDES_PHYSICAL_CONCURRENCY
         static unsigned physical_concurrency() BOOST_NOEXCEPT;
-#endif
 
 #define BOOST_THREAD_DEFINES_THREAD_NATIVE_HANDLE
         typedef detail::thread_data_base::native_handle_type native_handle_type;
diff --git a/src/pthread/thread.cpp b/src/pthread/thread.cpp
index e91473c2..39d476a4 100644
--- a/src/pthread/thread.cpp
+++ b/src/pthread/thread.cpp
@@ -27,7 +27,6 @@
 #include <unistd.h>
 #endif
 
-#ifdef BOOST_THREAD_PROVIDES_PHYSICAL_CONCURRENCY
 #include <boost/algorithm/string/split.hpp>
 #include <boost/algorithm/string/trim.hpp>
 #include <boost/lexical_cast.hpp>
@@ -36,7 +35,6 @@
 #include <string>
 #include <set>
 #include <vector>
-#endif
 
 #include "./timeconv.inl"
 
@@ -554,7 +552,6 @@ namespace boost
 #endif
     }
 
-#ifdef BOOST_THREAD_PROVIDES_PHYSICAL_CONCURRENCY
     unsigned thread::physical_concurrency() BOOST_NOEXCEPT
     {
 #ifdef __linux__
@@ -604,7 +601,6 @@ namespace boost
         return hardware_concurrency();
 #endif
     }
-#endif
 
 #if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
     void thread::interrupt()
diff --git a/src/win32/thread.cpp b/src/win32/thread.cpp
index f1774031..640664ef 100644
--- a/src/win32/thread.cpp
+++ b/src/win32/thread.cpp
@@ -417,7 +417,6 @@ namespace boost
         return info.dwNumberOfProcessors;
     }
 
-#ifdef BOOST_THREAD_PROVIDES_PHYSICAL_CONCURRENCY
     unsigned thread::physical_concurrency() BOOST_NOEXCEPT
     {
         unsigned cores = 0;
@@ -439,7 +438,6 @@ namespace boost
         }
         return cores;
     }
-#endif
 
     thread::native_handle_type thread::native_handle()
     {
diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index 10cbc4de..b2199203 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -209,7 +209,7 @@ rule thread-compile ( sources : reqs * : name )
           [ thread-test test_thread.cpp ]
           [ thread-test test_thread_id.cpp ]
           [ thread-test test_hardware_concurrency.cpp ]
-          #[ thread-test test_physical_concurrency.cpp ]
+          [ thread-test test_physical_concurrency.cpp ]
           [ thread-test test_thread_move.cpp ]
           [ thread-test test_thread_return_local.cpp ]
           [ thread-test test_thread_move_return.cpp ]