Index: libcfa/src/concurrency/kernel/cluster.hfa
===================================================================
--- libcfa/src/concurrency/kernel/cluster.hfa	(revision adb3ea11cfb69cd28183899617b6ad0124801eb1)
+++ libcfa/src/concurrency/kernel/cluster.hfa	(revision 8f01ad7153c7eaa08ba052530901201317088623)
@@ -13,4 +13,6 @@
 // Update Count     :
 //
+
+#pragma once
 
 #include "kernel/private.hfa"