diff --git a/common/JackThreadedDriver.cpp b/common/JackThreadedDriver.cpp
index 1fa80d3c..29fab30f 100644
--- a/common/JackThreadedDriver.cpp
+++ b/common/JackThreadedDriver.cpp
@@ -232,7 +232,7 @@ bool JackThreadedDriver::Init()
             jack_log("JackThreadedDriver::Init IsRealTime");
             // Will do "something" on OSX only...
             GetEngineControl()->fPeriod = GetEngineControl()->fConstraint = GetEngineControl()->fPeriodUsecs * 1000;
-            GetEngineControl()->fComputation = JackMachThread::ComputationMicroSec(GetEngineControl()->fBufferSize) * 1000;
+            GetEngineControl()->fComputation = ComputationMicroSec(GetEngineControl()->fBufferSize) * 1000;
             fThread.SetParams(GetEngineControl()->fPeriod, GetEngineControl()->fComputation, GetEngineControl()->fConstraint);
             if (fThread.AcquireSelfRealTime(GetEngineControl()->fServerPriority) < 0) {
                 jack_error("AcquireSelfRealTime error");
diff --git a/common/JackThreadedDriver.h b/common/JackThreadedDriver.h
index 9d4876b1..83d09faf 100644
--- a/common/JackThreadedDriver.h
+++ b/common/JackThreadedDriver.h
@@ -110,6 +110,18 @@ class SERVER_EXPORT JackThreadedDriver : public JackDriverClientInterface, publi
         virtual bool Execute();
         virtual bool Init();
 
+        // For OSX only
+        int ComputationMicroSec(int buffer_size)
+        {
+            if (buffer_size < 128) {
+                return 500;
+            } else if (buffer_size < 256) {
+                return 300;
+            } else {
+                return 100;
+            }
+        }
+
 };
 
 } // end of namespace
diff --git a/common/JackWaitThreadedDriver.cpp b/common/JackWaitThreadedDriver.cpp
index 5c2310c1..76637440 100644
--- a/common/JackWaitThreadedDriver.cpp
+++ b/common/JackWaitThreadedDriver.cpp
@@ -47,7 +47,7 @@ bool JackWaitThreadedDriver::Execute()
             jack_log("JackWaitThreadedDriver::Init IsRealTime");
             // Will do "something" on OSX only...
             GetEngineControl()->fPeriod = GetEngineControl()->fConstraint = GetEngineControl()->fPeriodUsecs * 1000;
-            GetEngineControl()->fComputation = JackMachThread::ComputationMicroSec(GetEngineControl()->fBufferSize) * 1000;
+            GetEngineControl()->fComputation = ComputationMicroSec(GetEngineControl()->fBufferSize) * 1000;
             fThread.SetParams(GetEngineControl()->fPeriod, GetEngineControl()->fComputation, GetEngineControl()->fConstraint);
             if (fThread.AcquireSelfRealTime(GetEngineControl()->fServerPriority) < 0) {
                 jack_error("AcquireSelfRealTime error");
diff --git a/macosx/JackMachThread.h b/macosx/JackMachThread.h
index d06c0af8..1aad4cc6 100644
--- a/macosx/JackMachThread.h
+++ b/macosx/JackMachThread.h
@@ -134,17 +134,6 @@ class SERVER_EXPORT JackMachThread : public JackPosixThread
         }
         static int DropRealTimeImp(jack_native_thread_t thread);
 
-        static int ComputationMicroSec(int buffer_size)
-        {
-            if (buffer_size < 128) {
-                return 500;
-            } else if (buffer_size < 256) {
-                return 300;
-            } else {
-                return 100;
-            }
-        }
-
 };
 
 } // end of namespace