diff --git a/src/plugins/qt4projectmanager/qtversionmanager.cpp b/src/plugins/qt4projectmanager/qtversionmanager.cpp
index eba4226c704fbf4be032b7ca687843d51b14ec57..a716fed9e2b1b18b7dc7ee18ec61bb1f10b9a8a5 100644
--- a/src/plugins/qt4projectmanager/qtversionmanager.cpp
+++ b/src/plugins/qt4projectmanager/qtversionmanager.cpp
@@ -1424,7 +1424,7 @@ QString QtVersion::buildDebuggingHelperLibrary()
         qmake.setWorkingDirectory(directory);
         qmake.setProcessChannelMode(QProcess::MergedChannels);
 
-        qmake.start(qmakeCommand(), QStringList()<<"-spec"<<"default"<<"gdbmacros.pro");
+        qmake.start(qmakeCommand(), QStringList()<<"-spec"<< mkspec() <<"gdbmacros.pro");
         qmake.waitForFinished();
 
         output += qmake.readAll();