diff --git CMakeLists.txt CMakeLists.txt
index 10969c2..dd28028 100644
--- e4rat-lite/CMakeLists.txt
+++ e4rat-lite/CMakeLists.txt
@@ -20,7 +20,7 @@ IF(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
 ENDIF(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)

 set(Boost_USE_STATIC_LIBS   OFF)
-set(Boost_USE_MULTITHREADED OFF)
+set(Boost_USE_MULTITHREADED ON)
 find_package(Boost 1.41 COMPONENTS system filesystem regex REQUIRED)
 set(${PROJECT_NAME}_LIBRARIES   ${${PROJECT_NAME}_LIBRARIES}
     ${Boost_LIBRARIES})