diff --git a/macosx/JackMachThread.cpp b/macosx/JackMachThread.cpp
index 2d809c2a..77191706 100644
--- a/macosx/JackMachThread.cpp
+++ b/macosx/JackMachThread.cpp
@@ -118,13 +118,13 @@ UInt32 JackMachThread::GetThreadPriority(pthread_t thread, int inWhichPriority)
     return 0;
 }
 
-int JackMachThread::GetParams(UInt64* period, UInt64* computation, UInt64* constraint)
+int JackMachThread::GetParams(pthread_t thread, UInt64* period, UInt64* computation, UInt64* constraint)
 {
     thread_time_constraint_policy_data_t theTCPolicy;
     mach_msg_type_number_t count = THREAD_TIME_CONSTRAINT_POLICY_COUNT;
     boolean_t get_default = false;
 
-    kern_return_t res = thread_policy_get(pthread_mach_thread_np(pthread_self()),
+    kern_return_t res = thread_policy_get(pthread_mach_thread_np(thread),
                                           THREAD_TIME_CONSTRAINT_POLICY,
                                           (thread_policy_t) & theTCPolicy,
                                           &count,
@@ -172,7 +172,7 @@ int JackMachThread::AcquireRealTimeImp(pthread_t thread, UInt64 period, UInt64 c
     UInt64 int_period;
     UInt64 int_computation;
     UInt64 int_constraint;
-    GetParams(&int_period, &int_computation, &int_constraint);
+    GetParams(thread, &int_period, &int_computation, &int_constraint);
     return 0;
 }
 
diff --git a/macosx/JackMachThread.h b/macosx/JackMachThread.h
index 4e17959b..533e4dea 100644
--- a/macosx/JackMachThread.h
+++ b/macosx/JackMachThread.h
@@ -107,7 +107,7 @@ class SERVER_EXPORT JackMachThread : public JackPosixThread
         int AcquireRealTime(int priority);
         int DropRealTime();
         void SetParams(UInt64 period, UInt64 computation, UInt64 constraint);
-        static int GetParams(UInt64* period, UInt64* computation, UInt64* constraint);
+        static int GetParams(pthread_t thread, UInt64* period, UInt64* computation, UInt64* constraint);
         static int SetThreadToPriority(pthread_t thread, UInt32 inPriority, Boolean inIsFixed, UInt64 period, UInt64 computation, UInt64 constraint);
 
         static int AcquireRealTimeImp(pthread_t thread, UInt64 period, UInt64 computation, UInt64 constraint);
diff --git a/macosx/coreaudio/JackCoreAudioDriver.cpp b/macosx/coreaudio/JackCoreAudioDriver.cpp
index 6c2222e7..0c3a1de9 100644
--- a/macosx/coreaudio/JackCoreAudioDriver.cpp
+++ b/macosx/coreaudio/JackCoreAudioDriver.cpp
@@ -218,7 +218,7 @@ OSStatus JackCoreAudioDriver::MeasureCallback(AudioDeviceID inDevice,
     AudioDeviceStop(driver->fDeviceID, MeasureCallback);
     
     jack_log("JackCoreAudioDriver::MeasureCallback called");
-    JackMachThread::GetParams(&driver->fEngineControl->fPeriod, &driver->fEngineControl->fComputation, &driver->fEngineControl->fConstraint);
+    JackMachThread::GetParams(pthread_self(), &driver->fEngineControl->fPeriod, &driver->fEngineControl->fComputation, &driver->fEngineControl->fConstraint);
     
     // Setup threadded based log function
     set_threaded_log_function();