--- a/kernel/eka/kernel/execs.txt	Wed Jun 23 12:52:28 2010 +0100
+++ b/kernel/eka/kernel/execs.txt	Wed Jun 23 12:58:21 2010 +0100
@@ -680,6 +680,8 @@
 
 slow {
 	name = MutexWait
+	return = TInt
+	arg2 = TInt
 	handle = mutex
 }