diff --git a/SuperBuild/CMake/External_itk.cmake b/SuperBuild/CMake/External_itk.cmake
index 16a9dcaef2992d5a73d4cc3840ca867103e4aa6c..203615e3227b1f5da56770d133656e68abeb3bc6 100644
--- a/SuperBuild/CMake/External_itk.cmake
+++ b/SuperBuild/CMake/External_itk.cmake
@@ -156,6 +156,7 @@ ExternalProject_Add(ITK
   -DITK_USE_SYSTEM_ZLIB:BOOL=ON
   -DITK_USE_SYSTEM_TIFF:BOOL=ON
   -DITK_USE_SYSTEM_PNG:BOOL=ON
+  -DITK_FORBID_DOWNLOADS:BOOL=ON
   ${ITK_SB_CONFIG}
   DEPENDS ${ITK_DEPENDENCIES}
   CMAKE_COMMAND ${SB_CMAKE_COMMAND}