diff --git a/cmake/SuperBuild.cmake b/cmake/SuperBuild.cmake
index 8349e70e..c5a1b01b 100644
--- a/cmake/SuperBuild.cmake
+++ b/cmake/SuperBuild.cmake
@@ -46,11 +46,11 @@ endmacro()
 
 set_vars(SUBPROJECT_CMAKE_ARGS CMAKE_OSX_DEPLOYMENT_TARGET)
 set_vars(SUBPROJECT_CMAKE_ARGS CMAKE_OSX_SYSROOT)
-set_vars(SUBPROJECT_CMAKE_ARGS CMAKE_OSX_ARCHITECTURES)
 set_vars(SUBPROJECT_CMAKE_ARGS CMAKE_C_COMPILER)
 set_vars(SUBPROJECT_CMAKE_ARGS CMAKE_CXX_COMPILER)
 set_vars(SUBPROJECT_CMAKE_ARGS CMAKE_BUILD_TYPE)
 
+set(SUBPROJECT_CMAKE_ARGS "${SUBPROJECT_CMAKE_ARGS};-DCMAKE_OSX_ARCHITECTURES=${CMAKE_OSX_ARCHITECTURES}" CACHE INTERNAL "")
 set(SUBPROJECT_CMAKE_ARGS "${SUBPROJECT_CMAKE_ARGS};-DCMAKE_POSITION_INDEPENDENT_CODE=ON" CACHE INTERNAL "")
 
 if(USE_CCACHE)