diff --git a/src/plugins/qmakeprojectmanager/qmakeparsernodes.cpp b/src/plugins/qmakeprojectmanager/qmakeparsernodes.cpp
index 5a75529e8ac..c8e34489e73 100644
--- a/src/plugins/qmakeprojectmanager/qmakeparsernodes.cpp
+++ b/src/plugins/qmakeprojectmanager/qmakeparsernodes.cpp
@@ -380,6 +380,11 @@ void QmakePriFile::watchFolders(const QSet<QString> &folders)
     m_watchedFolders = folders;
 }
 
+bool QmakePriFile::knowsFile(const FileName &filePath) const
+{
+    return m_recursiveEnumerateFiles.contains(filePath);
+}
+
 bool QmakePriFile::folderChanged(const QString &changedFolder, const QSet<FileName> &newFiles)
 {
     qCDebug(qmakeParse()) << "QmakePriFile::folderChanged";
diff --git a/src/plugins/qmakeprojectmanager/qmakeparsernodes.h b/src/plugins/qmakeprojectmanager/qmakeparsernodes.h
index 08149c76c5e..4fc39e8bc71 100644
--- a/src/plugins/qmakeprojectmanager/qmakeparsernodes.h
+++ b/src/plugins/qmakeprojectmanager/qmakeparsernodes.h
@@ -122,6 +122,8 @@ public:
 
     QmakePriFile *findPriFile(const Utils::FileName &fileName);
 
+    bool knowsFile(const Utils::FileName &filePath) const;
+
     void makeEmpty();
 
     QSet<Utils::FileName> files(const ProjectExplorer::FileType &type) const;
@@ -210,6 +212,7 @@ private:
     static void processValues(Internal::QmakePriFileEvalResult &result);
     void watchFolders(const QSet<QString> &folders);
 
+
     QmakeProject *m_project = nullptr;
     QmakeProFile *m_qmakeProFile = nullptr;
     QmakePriFile *m_parent = nullptr;