Index: /trunk/src/VBox/Runtime/r0drv/freebsd/thread-r0drv-freebsd.c
===================================================================
--- /trunk/src/VBox/Runtime/r0drv/freebsd/thread-r0drv-freebsd.c	(revision 35959)
+++ /trunk/src/VBox/Runtime/r0drv/freebsd/thread-r0drv-freebsd.c	(revision 35960)
@@ -102,5 +102,9 @@
 RTDECL(bool) RTThreadYield(void)
 {
+#if __FreeBSD_version >= 900032
+    kern_yield(curthread->td_user_pri);
+#else
     uio_yield();
+#endif
     return false; /** @todo figure this one ... */
 }