diff --git a/Modules/Qmitk/Testing/QmitkThreadedLogTest.cpp b/Modules/Qmitk/Testing/QmitkThreadedLogTest.cpp
index 9c8767609b..6a29b258d2 100644
--- a/Modules/Qmitk/Testing/QmitkThreadedLogTest.cpp
+++ b/Modules/Qmitk/Testing/QmitkThreadedLogTest.cpp
@@ -1,108 +1,110 @@
 /*===================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center,
 Division of Medical and Biological Informatics.
 All rights reserved.
 
 This software is distributed WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.
 
 See LICENSE.txt or http://www.mitk.org for details.
 
 ===================================================================*/
 
 #include "mitkCommon.h"
 #include "mitkTestingMacros.h"
 #include <mitkLog.h>
 #include <itksys/SystemTools.hxx>
 #include <mitkStandardFileLocations.h>
 
+#include <string>
+
 #include <QtConcurrentRun>
 
 
 void LogMessages(unsigned int threadID, unsigned int numberOfTimes = 5000)
 {
   unsigned int times = 0;
 
   while(times < numberOfTimes)
   {
     MITK_INFO << "Test info stream in thread" << threadID << "\n even with newlines";
     MITK_WARN << "Test warning stream in thread " << threadID <<". "
       << "Even with a very long text, even without meaning or implied meaning or content, just a long sentence to see whether something has problems with long sentences or output in files or into windows or commandlines or whatever.";
     MITK_DEBUG << "Test debugging stream in thread " << threadID;
     MITK_ERROR << "Test error stream in thread " << threadID;
     MITK_FATAL << "Test fatal stream in thread " << threadID;
 
     times= 5;
   }
 }
 
 /**
   \brief Test logging from Qt threads
 */
 static void TestThreadSaveLog(bool toFile)
 {
   bool testSucceded = true;
 
   try
   {
     if (toFile)
     {
-      std::string filename = mitk::StandardFileLocations::GetInstance()->GetOptionDirectory() "/qtestthreadlog.log";
+      std::string filename = mitk::StandardFileLocations::GetInstance()->GetOptionDirectory() + "/qtestthreadlog.log";
       mitk::LoggingBackend::SetLogFile(filename.c_str());
     }
 
     unsigned int numberOfThreads = 20;
     unsigned int threadRuntimeInMilliseconds = 4000;
     QVector< QFuture<void> > threads;
 
     // Spawn some threads
     for (unsigned int threadIdx = 0; threadIdx < numberOfThreads;+threadIdx)
     {
       threads.push_back( QtConcurrent::run( LogMessages, threadIdx, 1000 ) );
       std::cout << "Created " << threadIdx << ". thread." << std::endl;
     }
 
     //wait for some time (milliseconds)
     itksys::SystemTools::Delay( threadRuntimeInMilliseconds );
 
     // Wait for all to finish
     for (unsigned int threadIdx = 0; threadIdx < numberOfThreads;+threadIdx)
     {
       threads[threadIdx].waitForFinished();
       std::cout << threadIdx << ". thread has finished" << std::endl;
     }
   }
   catch(std::exception e)
   {
     MITK_ERROR << "exception during 'TestThreadSaveLog': "<<e.what();
     testSucceded = false;
   }
   catch(...)
   {
     MITK_ERROR << "unknown exception during 'TestThreadSaveLog'";
     testSucceded = false;
   }
 
   //if no error occured until now, everything is ok
   MITK_TEST_CONDITION_REQUIRED(testSucceded,"Test logging in different threads.");
 }
 
 int QmitkThreadedLogTest(int /* argc */, char* /*argv*/[])
 {
   // always start with this!
   MITK_TEST_BEGIN("QmitkThreadedLogTest")
 
   MITK_TEST_OUTPUT(<<"TESTING ALL LOGGING OUTPUTS, ERROR MESSAGES ARE ALSO TESTED AND NOT MEANING AN ERROR OCCURED!")
 
   TestThreadSaveLog( false ); // false = to console
   TestThreadSaveLog( true );  // true = to file
 
   MITK_TEST_OUTPUT(<<"Number of threads in QThreadPool: " << QThreadPool::globalInstance()->maxThreadCount() )
 
   // always end with this!
   MITK_TEST_END()
 }