diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6ce72640b3dc89ca61c70089d9c484706398691c..4d6c76b0824d12ce605863624c6cf58657ce3699 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,6 +44,7 @@ FIND_PACKAGE(Qt4 COMPONENTS QtCore)
 
 # ADD_DEFINITIONS(${SWIFTEN_CFLAGS})
 ADD_DEFINITIONS(-DSUPPORT_LEGACY_CAPS)
+ADD_DEFINITIONS(-DBOOST_FILESYSTEM_VERSION=2)
 
 message("  Supported features")
 message("-----------------------")