diff --git a/bootstrap/cmake_modules/FindBootstrap.cmake b/bootstrap/cmake_modules/FindBootstrap.cmake
index b680a548..1cf1c9f4 100644
--- a/bootstrap/cmake_modules/FindBootstrap.cmake
+++ b/bootstrap/cmake_modules/FindBootstrap.cmake
@@ -193,6 +193,7 @@
    foreach(LIBRARY IN LISTS ${Boost_LIBRARIES})
      message(STATUS "  ${LIBRARY}")
    endforeach(LIBRARY)
+   add_definitions(-DBOOST_FILESYSTEM_VERSION=2) # for boost 1.46 and more we need to specify to use filesystem v2 and not v3
  endmacro(setup_boost)