diff --git a/CMakeExternals/DCMTK.cmake b/CMakeExternals/DCMTK.cmake
index e2792d9230..aa487ac78d 100644
--- a/CMakeExternals/DCMTK.cmake
+++ b/CMakeExternals/DCMTK.cmake
@@ -1,68 +1,69 @@
 #-----------------------------------------------------------------------------
 # DCMTK
 #-----------------------------------------------------------------------------
 
 if(MITK_USE_DCMTK)
 
   # Sanity checks
   if(DEFINED DCMTK_DIR AND NOT EXISTS ${DCMTK_DIR})
     message(FATAL_ERROR "DCMTK_DIR variable is defined but corresponds to non-existing directory")
   endif()
 
   set(proj DCMTK)
   set(proj_DEPENDENCIES )
   set(DCMTK_DEPENDS ${proj})
 
   if(NOT DEFINED DCMTK_DIR)
     if(DCMTK_DICOM_ROOT_ID)
       set(DCMTK_CXX_FLAGS "${DCMTK_CXX_FLAGS} -DSITE_UID_ROOT=\\\"${DCMTK_DICOM_ROOT_ID}\\\"")
       set(DCMTK_C_FLAGS "${DCMTK_CXX_FLAGS} -DSITE_UID_ROOT=\\\"${DCMTK_DICOM_ROOT_ID}\\\"")
     endif()
 
     set(additional_args )
     if(CTEST_USE_LAUNCHERS)
       list(APPEND additional_args
         "-DCMAKE_PROJECT_${proj}_INCLUDE:FILEPATH=${CMAKE_ROOT}/Modules/CTestUseLaunchers.cmake"
       )
     endif()
 
     mitk_query_custom_ep_vars()
 
     ExternalProject_Add(${proj}
       LIST_SEPARATOR ${sep}
       URL ${MITK_THIRDPARTY_DOWNLOAD_PREFIX_URL}/dcmtk_29f9de10.tar.gz
       URL_MD5 c4b13ef2e694f3b8c50d7181fc959f4a
       CMAKE_GENERATOR ${gen}
       CMAKE_GENERATOR_PLATFORM ${gen_platform}
       CMAKE_ARGS
          ${ep_common_args}
          ${additional_args}
          "-DCMAKE_CXX_FLAGS:STRING=${CMAKE_CXX_FLAGS} ${DCMTK_CXX_FLAGS}"
          "-DCMAKE_C_FLAGS:STRING=${CMAKE_C_FLAGS} ${DCMTK_C_FLAGS}"
          -DDCMTK_ENABLE_CXX11:BOOL=ON
          -DDCMTK_ENABLE_STL:BOOL=ON
          -DDCMTK_WITH_DOXYGEN:BOOL=OFF
          -DDCMTK_WITH_ZLIB:BOOL=OFF # see bug #9894
          -DDCMTK_WITH_OPENSSL:BOOL=OFF # see bug #9894
          -DDCMTK_WITH_PNG:BOOL=OFF # see bug #9894
          -DDCMTK_WITH_TIFF:BOOL=OFF  # see bug #9894
          -DDCMTK_WITH_XML:BOOL=OFF  # see bug #9894
          -DDCMTK_WITH_ICONV:BOOL=OFF  # see bug #9894
+         -DDCMTK_WITH_ICU:BOOL=OFF  # see T26438
          ${${proj}_CUSTOM_CMAKE_ARGS}
       CMAKE_CACHE_ARGS
         ${ep_common_cache_args}
         ${${proj}_CUSTOM_CMAKE_CACHE_ARGS}
       CMAKE_CACHE_DEFAULT_ARGS
         ${ep_common_cache_default_args}
         ${${proj}_CUSTOM_CMAKE_CACHE_DEFAULT_ARGS}
       DEPENDS ${proj_DEPENDENCIES}
       )
     set(DCMTK_DIR ${ep_prefix})
     mitkFunctionInstallExternalCMakeProject(${proj})
 
   else()
 
     mitkMacroEmptyExternalProject(${proj} "${proj_DEPENDENCIES}")
 
   endif()
 endif()