diff --git a/src/plugins/qt4projectmanager/qt4nodes.cpp b/src/plugins/qt4projectmanager/qt4nodes.cpp
index d5069518d9a..437319ef3d1 100644
--- a/src/plugins/qt4projectmanager/qt4nodes.cpp
+++ b/src/plugins/qt4projectmanager/qt4nodes.cpp
@@ -720,6 +720,7 @@ void Qt4PriFileNode::watchFolders(const QSet<QString> &folders)
 
 void Qt4PriFileNode::folderChanged(const QString &changedFolder)
 {
+    Q_UNUSED(changedFolder);
     scheduleUpdate();
 }