diff --git a/lib/cpp/src/concurrency/PosixThreadFactory.h b/lib/cpp/src/concurrency/PosixThreadFactory.h
index 894d5f5..9a9e2af 100644
--- a/lib/cpp/src/concurrency/PosixThreadFactory.h
+++ b/lib/cpp/src/concurrency/PosixThreadFactory.h
@@ -71,7 +71,7 @@
    * By default threads are joinable.
    */
 
-  PosixThreadFactory(POLICY policy=ROUND_ROBIN, PRIORITY priority=NORMAL, int stackSize=1, bool detached=false);
+  PosixThreadFactory(POLICY policy=ROUND_ROBIN, PRIORITY priority=NORMAL, int stackSize=1, bool detached=true);
 
   // From ThreadFactory;
   boost::shared_ptr<Thread> newThread(boost::shared_ptr<Runnable> runnable) const;