diff --git a/CMakeExternals/ITK.cmake b/CMakeExternals/ITK.cmake
index 3b099de8ab..f9b0cdb3ce 100644
--- a/CMakeExternals/ITK.cmake
+++ b/CMakeExternals/ITK.cmake
@@ -1,66 +1,67 @@
 #-----------------------------------------------------------------------------
 # ITK
 #-----------------------------------------------------------------------------
 
 # Sanity checks
 if(DEFINED ITK_DIR AND NOT EXISTS ${ITK_DIR})
   message(FATAL_ERROR "ITK_DIR variable is defined but corresponds to non-existing directory")
 endif()
 
 set(proj ITK)
 set(proj_DEPENDENCIES GDCM)
 if(MITK_USE_Python)
   list(APPEND proj_DEPENDENCIES CableSwig)
 endif()
 
 set(ITK_DEPENDS ${proj})
 
 if(NOT DEFINED ITK_DIR)
 
   set(additional_cmake_args )
   if(MINGW)
     set(additional_cmake_args
         -DCMAKE_USE_WIN32_THREADS:BOOL=ON
         -DCMAKE_USE_PTHREADS:BOOL=OFF)
   endif()
 
   if(MITK_USE_Python)
     list(APPEND additional_cmake_args
          -DUSE_WRAP_ITK:BOOL=ON
          -DITK_USE_REVIEW:BOOL=ON
          -DCableSwig_DIR:PATH=${CableSwig_DIR}
          -DWRAP_ITK_JAVA:BOOL=OFF
-         -DWRAP_ITK_TCL:BOOL=OFF
+         -DWRAP_ITK_TCL:BOOL=OFFF
+         -DWRAP_unsigned_char:BOOL=ON
         )
   endif()
 
   if(GDCM_IS_2_0_18)
     set(ITK_PATCH_COMMAND ${CMAKE_COMMAND} -DTEMPLATE_FILE:FILEPATH=${MITK_SOURCE_DIR}/CMakeExternals/EmptyFileForPatching.dummy -P ${MITK_SOURCE_DIR}/CMakeExternals/PatchITK-3.20.cmake)
   endif()
 
   ExternalProject_Add(${proj}
      SOURCE_DIR ${CMAKE_BINARY_DIR}/${proj}-src
      BINARY_DIR ${proj}-build
      PREFIX ${proj}-cmake
      URL ${MITK_THIRDPARTY_DOWNLOAD_PREFIX_URL}/InsightToolkit-3.20.1.tar.gz
      URL_MD5 90342ffa78bd88ae48b3f62866fbf050
      INSTALL_COMMAND ""
      PATCH_COMMAND ${ITK_PATCH_COMMAND}
      CMAKE_GENERATOR ${gen}
      CMAKE_ARGS
        ${ep_common_args}
        ${additional_cmake_args}
        -DBUILD_TESTING:BOOL=OFF
        -DBUILD_EXAMPLES:BOOL=OFF
        -DITK_USE_SYSTEM_GDCM:BOOL=ON
        -DGDCM_DIR:PATH=${GDCM_DIR}
      DEPENDS ${proj_DEPENDENCIES}
     )
 
   set(ITK_DIR ${CMAKE_CURRENT_BINARY_DIR}/${proj}-build)
 
 else()
 
   mitkMacroEmptyExternalProject(${proj} "${proj_DEPENDENCIES}")
 
 endif()