Index: src/libcfa/concurrency/kernel
===================================================================
--- src/libcfa/concurrency/kernel	(revision f5478c89f22dfaa80c81adb28a7eba9eb97eb1a7)
+++ src/libcfa/concurrency/kernel	(revision eddb39936d955da0421ebec4870c03688f9c4a46)
@@ -19,4 +19,5 @@
 
 #include "invoke.h"
+#include "bits/cfatime.h"
 
 extern "C" {
@@ -48,6 +49,8 @@
 
 	// Preemption rate on this cluster
-	unsigned long long int preemption;
+	__cfa_time_t preemption_rate;
 };
+
+extern __cfa_time_t default_preemption();
 
 void ?{} (cluster & this);