diff --git a/src/plugins/qt4projectmanager/qt4projectmanager.pro b/src/plugins/qt4projectmanager/qt4projectmanager.pro
index 822cb139752d5e80a10fb9af0355f5026919db99..ea23478ee2a5d659451ed51bff382f38373d8ef8 100644
--- a/src/plugins/qt4projectmanager/qt4projectmanager.pro
+++ b/src/plugins/qt4projectmanager/qt4projectmanager.pro
@@ -1,6 +1,6 @@
 TEMPLATE = lib
 TARGET = Qt4ProjectManager
-DEFINES +=  QT4PROJECTMANAGER_LIBRARY
+DEFINES += QT_CREATOR QT4PROJECTMANAGER_LIBRARY
 QT += network
 include(../../qtcreatorplugin.pri)
 include(qt4projectmanager_dependencies.pri)