diff --git a/src/plugins/qt4projectmanager/qt4nodes.cpp b/src/plugins/qt4projectmanager/qt4nodes.cpp
index 766519ee10e..002eb5fd1ae 100644
--- a/src/plugins/qt4projectmanager/qt4nodes.cpp
+++ b/src/plugins/qt4projectmanager/qt4nodes.cpp
@@ -257,6 +257,11 @@ Qt4PriFileNode::Qt4PriFileNode(Qt4Project *project, Qt4ProFileNode* qt4ProFileNo
     setIcon(qt4NodeStaticData()->projectIcon);
 }
 
+Qt4PriFileNode::~Qt4PriFileNode()
+{
+    watchFolders(QSet<QString>());
+}
+
 void Qt4PriFileNode::scheduleUpdate()
 {
     QtSupport::ProFileCacheManager::instance()->discardFile(m_projectFilePath);
diff --git a/src/plugins/qt4projectmanager/qt4nodes.h b/src/plugins/qt4projectmanager/qt4nodes.h
index dfaec5e67b2..8df585e1acb 100644
--- a/src/plugins/qt4projectmanager/qt4nodes.h
+++ b/src/plugins/qt4projectmanager/qt4nodes.h
@@ -129,6 +129,7 @@ class QT4PROJECTMANAGER_EXPORT Qt4PriFileNode : public ProjectExplorer::ProjectN
 
 public:
     Qt4PriFileNode(Qt4Project *project, Qt4ProFileNode* qt4ProFileNode, const QString &filePath);
+    ~Qt4PriFileNode();
 
     void update(ProFile *includeFileExact, QtSupport::ProFileReader *readerExact, ProFile *includeFileCumlative, QtSupport::ProFileReader *readerCumalative);