Index: /trunk/src/VBox/Runtime/r0drv/freebsd/semfastmutex-r0drv-freebsd.c
===================================================================
--- /trunk/src/VBox/Runtime/r0drv/freebsd/semfastmutex-r0drv-freebsd.c	(revision 39655)
+++ /trunk/src/VBox/Runtime/r0drv/freebsd/semfastmutex-r0drv-freebsd.c	(revision 39656)
@@ -67,5 +67,5 @@
     {
         pThis->u32Magic = RTSEMFASTMUTEX_MAGIC;
-        sx_init(&pThis->SxLock, "IPRT Fast Mutex Semaphore");
+        sx_init_flags(&pThis->SxLock, "IPRT Fast Mutex Semaphore", SX_DUPOK);
 
         *phFastMtx = pThis;