diff --git a/cpukit/ChangeLog b/cpukit/ChangeLog
index 8caedf3051..4903f2a6ce 100644
--- a/cpukit/ChangeLog
+++ b/cpukit/ChangeLog
@@ -1,3 +1,8 @@
+2011-10-18	Sebastian Huber <sebastian.huber@embedded-brains.de>
+
+	PR 1939/cpukit
+	* rtems/src/ratemonperiod.c: Fixed type mismatch.
+
 2011-10-18	Ralf Corsépius <ralf.corsepius@rtems.org>
 
 	* libcsupport/include/rtems/libio.h, libcsupport/src/termios.c:
diff --git a/cpukit/rtems/src/ratemonperiod.c b/cpukit/rtems/src/ratemonperiod.c
index 4af3f90b5b..28a83d72a1 100644
--- a/cpukit/rtems/src/ratemonperiod.c
+++ b/cpukit/rtems/src/ratemonperiod.c
@@ -129,18 +129,17 @@ void _Rate_monotonic_Initiate_statistics(
    */
   #ifndef __RTEMS_USE_TICKS_FOR_STATISTICS__
     if (owning_thread == _Thread_Executing) {
-
-      rtems_thread_cpu_usage_t ran;
+      Timestamp_Control ran;
 
       /*
        *  Adjust the CPU time used to account for the time since last
        *  context switch.
        */
-      _Timespec_Subtract(
+      _Timestamp_Subtract(
         &_Thread_Time_of_last_context_switch, &uptime, &ran
       );
 
-      _Timespec_Add_to( &the_period->cpu_usage_period_initiated, &ran );
+      _Timestamp_Add_to( &the_period->cpu_usage_period_initiated, &ran );
     }
   #endif