diff --git a/INSTALL-cmake b/INSTALL-cmake
index d65c3fb..ad94936 100644
--- a/INSTALL-cmake
+++ b/INSTALL-cmake
@@ -10,10 +10,10 @@ before running cmake.
 On some systems cmake doesn't detect that it is a threaded qt-version. So you should
 do
 
-export CXXFLAGS="-DQT_THREAD_SUPPORT"
+export CXXFLAGS="-DTQT_THREAD_SUPPORT"
 
 before running cmake.
-(Or give it as parameter to cmake with -DCMAKE_CXX_FLAGS="-DQT_THREAD_SUPPORT")
+(Or give it as parameter to cmake with -DCMAKE_CXX_FLAGS="-DTQT_THREAD_SUPPORT")
 
 
 Prepare install