--- src/platform-freebsd.cc.orig	2012-05-12 16:47:50.556202492 +0100
+++ src/platform-freebsd.cc	2012-05-12 16:37:59.924934272 +0100
@@ -554,6 +554,7 @@
     ASSERT(result == 0);
     result = pthread_mutex_init(&mutex_, &attrs);
     ASSERT(result == 0);
+    USE(result);
   }
 
   virtual ~FreeBSDMutex() { pthread_mutex_destroy(&mutex_); }