diff --git a/include/boost/config/platform/bsd.hpp b/include/boost/config/platform/bsd.hpp
index 17496d85..df230850 100644
--- a/include/boost/config/platform/bsd.hpp
+++ b/include/boost/config/platform/bsd.hpp
@@ -36,7 +36,7 @@
 // FreeBSD 3.x has pthreads support, but defines _POSIX_THREADS in <pthread.h>
 // and not in <unistd.h>
 //
-#if defined(__FreeBSD__) && (__FreeBSD__ <= 3)
+#if (defined(__FreeBSD__) && (__FreeBSD__ <= 3)) || defined(__OpenBSD__)
 #  define BOOST_HAS_PTHREADS
 #endif