Index: tests/unified_locking/fast.cfa
===================================================================
--- tests/unified_locking/fast.cfa	(revision 5a46e09dae381c4d10eda5d14c8e5293ab0dcbb9)
+++ tests/unified_locking/fast.cfa	(revision 660665fdcc1db2b22595e18697e5ba335dda9b19)
@@ -22,5 +22,5 @@
 uint32_t cs() {
 	$thread * me = active_thread();
-	uint32_t value = (uint32_t)me;
+	uint32_t value;
 	lock(mo.l);
 	{
@@ -28,4 +28,5 @@
 		mo.id = me;
 		yield(random(5));
+		value = ((uint32_t)random()) ^ ((uint32_t)me);
 		if(mo.id != me) sout | "Intruder!";
 		mo.sum = tsum + value;