diff --git a/pokerth_game.pro b/pokerth_game.pro
index de64d441..37f0b322 100644
--- a/pokerth_game.pro
+++ b/pokerth_game.pro
@@ -19,7 +19,7 @@ QMAKE_CXXFLAGS += -std=gnu++0x
 UI_DIR = uics
 MOC_DIR = mocs
 OBJECTS_DIR = obj
-DEFINES += ENABLE_IPV6 TIXML_USE_STL
+DEFINES += ENABLE_IPV6 TIXML_USE_STL BOOST_FILESYSTEM_VERSION=2
 DEFINES += PREFIX=\"$${PREFIX}\"
 TARGET = pokerth
 
diff --git a/pokerth_lib.pro b/pokerth_lib.pro
index b43da587..df4ce628 100644
--- a/pokerth_lib.pro
+++ b/pokerth_lib.pro
@@ -12,7 +12,7 @@ UI_DIR = uics
 TARGET = lib/pokerth_lib
 MOC_DIR = mocs
 OBJECTS_DIR = obj
-DEFINES += ENABLE_IPV6 TIXML_USE_STL
+DEFINES += ENABLE_IPV6 TIXML_USE_STL BOOST_FILESYSTEM_VERSION=2
 QT -= core gui
 QMAKE_CXXFLAGS += -std=gnu++0x
 #PRECOMPILED_HEADER = src/pch_lib.h
diff --git a/pokerth_server.pro b/pokerth_server.pro
index 1dafba69..8572fb7f 100644
--- a/pokerth_server.pro
+++ b/pokerth_server.pro
@@ -14,7 +14,7 @@ TARGET = bin/pokerth_server
 MOC_DIR = mocs
 OBJECTS_DIR = obj
 DEFINES += POKERTH_DEDICATED_SERVER
-DEFINES += ENABLE_IPV6 TIXML_USE_STL
+DEFINES += ENABLE_IPV6 TIXML_USE_STL BOOST_FILESYSTEM_VERSION=2
 DEFINES += PREFIX=\"$${PREFIX}\"
 QT -= core gui
 QMAKE_CXXFLAGS += -std=gnu++0x