diff --git a/ChangeLog b/ChangeLog
index 06ad74ec..94a3315f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -11,7 +11,11 @@ Tom Szilagyi
 
 ---------------------------
   Jackdmp changes log
----------------------------
+---------------------------
+
+2007-10-23 Stephane Letz  <letz@grame.fr>
+
+	* Correct jack_acquire_real_time_scheduling on OSX.
 
 2007-10-18 Stephane Letz  <letz@grame.fr>
 
diff --git a/common/JackAPI.cpp b/common/JackAPI.cpp
index a63f88f9..f83dd56a 100644
--- a/common/JackAPI.cpp
+++ b/common/JackAPI.cpp
@@ -1386,7 +1386,7 @@ EXPORT void jack_reset_max_delayed_usecs(jack_client_t* ext_client)
 EXPORT int jack_acquire_real_time_scheduling(pthread_t thread, int priority)
 {
 	#ifdef __APPLE__
-		return JackMachThread::AcquireRealTimeImp(thread, 0, 500 * 1000, 500 * 1000);
+		return JackMachThread::AcquireRealTimeImp(thread, GetEngineControl()->fPeriod, GetEngineControl()->fComputation, GetEngineControl()->fConstraint);
 	#elif WIN32
 		return JackWinThread::AcquireRealTimeImp(thread, priority);
 	#else