diff --git a/bitcoin-qt.pro b/bitcoin-qt.pro
index ed2cfa8f..c7d81ed6 100644
--- a/bitcoin-qt.pro
+++ b/bitcoin-qt.pro
@@ -4,6 +4,7 @@ VERSION = 0.7.0
 INCLUDEPATH += src src/json src/qt
 DEFINES += QT_GUI BOOST_THREAD_USE_LIB BOOST_SPIRIT_THREADSAFE
 CONFIG += no_include_pwd
+CONFIG += thread
 
 # for boost 1.37, add -mt to the boost libraries
 # use: qmake BOOST_LIB_SUFFIX=-mt
@@ -346,6 +347,9 @@ macx:LIBS += -framework Foundation -framework ApplicationServices -framework App
 macx:DEFINES += MAC_OSX MSG_NOSIGNAL=0
 macx:ICON = src/qt/res/icons/bitcoin.icns
 macx:TARGET = "Bitcoin-Qt"
+macx:QMAKE_CFLAGS_THREAD += -pthread
+macx:QMAKE_LFLAGS_THREAD += -pthread
+macx:QMAKE_CXXFLAGS_THREAD += -pthread
 
 # Set libraries and includes at end, to use platform-defined defaults if not overridden
 INCLUDEPATH += $$BOOST_INCLUDE_PATH $$BDB_INCLUDE_PATH $$OPENSSL_INCLUDE_PATH $$QRENCODE_INCLUDE_PATH