diff --git a/CMakeExternals/OpenCV.cmake b/CMakeExternals/OpenCV.cmake
index fcc38cd141..bbf8c8715f 100644
--- a/CMakeExternals/OpenCV.cmake
+++ b/CMakeExternals/OpenCV.cmake
@@ -1,98 +1,100 @@
 #-----------------------------------------------------------------------------
 # OpenCV
 #-----------------------------------------------------------------------------
 
 if(MITK_USE_OpenCV)
 
   # Sanity checks
   if(DEFINED OpenCV_DIR AND NOT EXISTS ${OpenCV_DIR})
     message(FATAL_ERROR "OpenCV_DIR variable is defined but corresponds to non-existing directory")
   endif()
 
   set(proj OpenCV)
   set(proj_DEPENDENCIES)
   set(OpenCV_DEPENDS ${proj})
 
   if(NOT DEFINED OpenCV_DIR)
 
     set(additional_cmake_args
       -DBUILD_opencv_java:BOOL=OFF
       -DBUILD_opencv_ts:BOOL=OFF
       -DBUILD_PERF_TESTS:BOOL=OFF
     )
 
     if(MITK_USE_Python)
       set(CV_PACKAGE_PATH -DPYTHON_PACKAGES_PATH:PATH=${ep_prefix}/lib/python${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR}/site-packages)
 
       list(APPEND additional_cmake_args
          -DBUILD_opencv_python:BOOL=ON
          -DBUILD_opencv_python3:BOOL=ON
          #-DBUILD_NEW_PYTHON_SUPPORT:BOOL=ON
          -DPYTHON_DEBUG_LIBRARY:FILEPATH=${PYTHON_DEBUG_LIBRARY}
          -DPYTHON_EXECUTABLE:FILEPATH=${PYTHON_EXECUTABLE}
          -DPYTHON_INCLUDE_DIR:PATH=${PYTHON_INCLUDE_DIR}
          -DPYTHON_INCLUDE_DIR2:PATH=${PYTHON_INCLUDE_DIR2}
          -DPYTHON_LIBRARY:FILEPATH=${PYTHON_LIBRARY}
          ${CV_PACKAGE_PATH}
          #-DPYTHON_LIBRARIES=${PYTHON_LIBRARY}
          #-DPYTHON_DEBUG_LIBRARIES=${PYTHON_DEBUG_LIBRARIES}
           )
     else()
       list(APPEND additional_cmake_args
          -DBUILD_opencv_python:BOOL=OFF
          -DBUILD_opencv_python3:BOOL=OFF
          -DBUILD_opencv_python_bindings_generator:BOOL=OFF
          #-DBUILD_NEW_PYTHON_SUPPORT:BOOL=OFF
           )
     endif()
 
     # 12-05-02, muellerm, added QT usage by OpenCV if QT is used in MITK
     # 12-09-11, muellerm, removed automatic usage again, since this will struggle with the MITK Qt application object
     if(MITK_USE_Qt5)
       list(APPEND additional_cmake_args
            -DWITH_QT:BOOL=OFF
            -DWITH_QT_OPENGL:BOOL=OFF
            -DQT_QMAKE_EXECUTABLE:FILEPATH=${QT_QMAKE_EXECUTABLE}
           )
     endif()
 
     if(CTEST_USE_LAUNCHERS)
       list(APPEND additional_cmake_args
         "-DCMAKE_PROJECT_${proj}_INCLUDE:FILEPATH=${CMAKE_ROOT}/Modules/CTestUseLaunchers.cmake"
       )
     endif()
 
-    set(opencv_url ${MITK_THIRDPARTY_DOWNLOAD_PREFIX_URL}/opencv-3.4.1.zip)
-    set(opencv_url_md5 8464ce888f4c283895626950bada1e44)
+    set(opencv_url ${MITK_THIRDPARTY_DOWNLOAD_PREFIX_URL}/opencv-3.4.1.tar.gz)
+    set(opencv_url_md5 a0b7a47899e67b3490ea31edc4f6e8e6)
     ExternalProject_Add(${proj}
       LIST_SEPARATOR ${sep}
       URL ${opencv_url}
       URL_MD5 ${opencv_url_md5}
       CMAKE_GENERATOR ${gen}
       CMAKE_ARGS
         ${ep_common_args}
         -DBUILD_TESTS:BOOL=OFF
         -DBUILD_DOCS:BOOL=OFF
         -DBUILD_EXAMPLES:BOOL=OFF
         -DBUILD_DOXYGEN_DOCS:BOOL=OFF
         -DWITH_CUDA:BOOL=OFF
         -DWITH_VTK:BOOL=OFF
         -DENABLE_CXX11:BOOL=ON
+        -DWITH_IPP:BOOL=OFF
+        -DBUILD_IPP_IW:BOOL=OFF
         ${additional_cmake_args}
       CMAKE_CACHE_ARGS
         ${ep_common_cache_args}
       CMAKE_CACHE_DEFAULT_ARGS
         ${ep_common_cache_default_args}
       DEPENDS ${proj_DEPENDENCIES}
     )
 
     set(OpenCV_DIR ${ep_prefix})
     mitkFunctionInstallExternalCMakeProject(${proj})
 
   else()
 
     mitkMacroEmptyExternalProject(${proj} "${proj_DEPENDENCIES}")
 
   endif()
 
 endif()