--- a/gruel/src/lib/thread.cc
+++ b/gruel/src/lib/thread.cc
@@ -95,7 +95,7 @@
   }
 } /* namespace gruel */
 
-#elif defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__)
+#elif defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__) || defined(__FreeBSD_kernel__)
 
 namespace gruel {
 
