--- a/gnuradio-runtime/lib/thread/thread.cc
+++ b/gnuradio-runtime/lib/thread/thread.cc
@@ -115,7 +115,7 @@
 } /* namespace gr */
 
 
-#elif defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__)
+#elif defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__) || defined(__FreeBSD_kernel__)
 
 namespace gr {
   namespace thread {
