diff --git a/Modules/PhotoacousticsLib/test/mitkMCThreadHandlerTest.cpp b/Modules/PhotoacousticsLib/test/mitkMCThreadHandlerTest.cpp
index 1607acc6cd..7e2fce908f 100644
--- a/Modules/PhotoacousticsLib/test/mitkMCThreadHandlerTest.cpp
+++ b/Modules/PhotoacousticsLib/test/mitkMCThreadHandlerTest.cpp
@@ -1,124 +1,124 @@
 /*===================================================================
 
 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 <mitkTestFixture.h>
 #include <mitkTestingMacros.h>
 
 #include <mitkPAMonteCarloThreadHandler.h>
 
 // us
 #include <usModule.h>
 #include <usModuleResource.h>
 #include <usGetModuleContext.h>
 #include <usModuleContext.h>
 #include <usModuleResourceStream.h>
 
 #include <random>
 #include <chrono>
 
 class mitkMCThreadHandlerTestSuite : public mitk::TestFixture
 {
   CPPUNIT_TEST_SUITE(mitkMCThreadHandlerTestSuite);
   MITK_TEST(testConstructorBehavior);
   MITK_TEST(testCorrectNumberOfPhotons);
   MITK_TEST(testCorrectNumberOfPhotonsWithUnevenPackageSize);
   MITK_TEST(testCorrectNumberOfPhotonsWithTooLargePackageSize);
   MITK_TEST(testCorrectTimeMeasure);
   CPPUNIT_TEST_SUITE_END();
 
 private:
 
   mitk::pa::MonteCarloThreadHandler::Pointer m_MonteCarloThreadHandler;
   long m_NumberOrTime = 500;
 
 public:
 
   void setUp() override
   {
   }
 
   void testConstructorBehavior()
   {
     auto threadHandler1 = mitk::pa::MonteCarloThreadHandler::New(m_NumberOrTime, true, true);
     auto threadHandler2 = mitk::pa::MonteCarloThreadHandler::New(m_NumberOrTime, true);
 
     CPPUNIT_ASSERT(mitk::pa::Equal(threadHandler1, threadHandler2, 1e-6, true));
   }
 
   void testCorrectTimeMeasure()
   {
     for (int i = 0; i < 10; i++)
     {
       m_MonteCarloThreadHandler = mitk::pa::MonteCarloThreadHandler::New(m_NumberOrTime, true, false);
       auto timeBefore = std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::high_resolution_clock::now().time_since_epoch()).count();
       long nextWorkPackage = 0;
       while ((nextWorkPackage = m_MonteCarloThreadHandler->GetNextWorkPackage()) > 0)
       {//Do nothing
       }
       auto timeAfter = std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::high_resolution_clock::now().time_since_epoch()).count();
 
       //Assert that the time error is less than 10% in a 500ms sample size
       //This test might not be stable when on different machines.
-      CPPUNIT_ASSERT(std::abs((timeAfter - timeBefore) - m_NumberOrTime) <= 50);
+      CPPUNIT_ASSERT(std::labs((timeAfter - timeBefore) - m_NumberOrTime) <= 50);
     }
   }
 
   void testCorrectNumberOfPhotons()
   {
     m_MonteCarloThreadHandler = mitk::pa::MonteCarloThreadHandler::New(m_NumberOrTime, false, false);
     m_MonteCarloThreadHandler->SetPackageSize(100);
     long numberOfPhotonsSimulated = 0;
     long nextWorkPackage = 0;
     while ((nextWorkPackage = m_MonteCarloThreadHandler->GetNextWorkPackage()) > 0)
     {
       numberOfPhotonsSimulated += nextWorkPackage;
     }
     CPPUNIT_ASSERT(numberOfPhotonsSimulated == m_NumberOrTime);
   }
 
   void testCorrectNumberOfPhotonsWithUnevenPackageSize()
   {
     m_MonteCarloThreadHandler = mitk::pa::MonteCarloThreadHandler::New(m_NumberOrTime, false, false);
     m_MonteCarloThreadHandler->SetPackageSize(77);
     long numberOfPhotonsSimulated = 0;
     long nextWorkPackage = 0;
     while ((nextWorkPackage = m_MonteCarloThreadHandler->GetNextWorkPackage()) > 0)
     {
       numberOfPhotonsSimulated += nextWorkPackage;
     }
     CPPUNIT_ASSERT(numberOfPhotonsSimulated == m_NumberOrTime);
   }
 
   void testCorrectNumberOfPhotonsWithTooLargePackageSize()
   {
     m_MonteCarloThreadHandler = mitk::pa::MonteCarloThreadHandler::New(m_NumberOrTime, false, false);
     m_MonteCarloThreadHandler->SetPackageSize(10000);
     long numberOfPhotonsSimulated = 0;
     long nextWorkPackage = 0;
     while ((nextWorkPackage = m_MonteCarloThreadHandler->GetNextWorkPackage()) > 0)
     {
       numberOfPhotonsSimulated += nextWorkPackage;
     }
     CPPUNIT_ASSERT(numberOfPhotonsSimulated == m_NumberOrTime);
   }
 
   void tearDown() override
   {
     m_MonteCarloThreadHandler = nullptr;
   }
 };
 
 MITK_TEST_SUITE_REGISTRATION(mitkMCThreadHandler)