diff --git a/src/plugins/qt4projectmanager/qt4nodes.cpp b/src/plugins/qt4projectmanager/qt4nodes.cpp
index 93eecf273ac..c119c4e6828 100644
--- a/src/plugins/qt4projectmanager/qt4nodes.cpp
+++ b/src/plugins/qt4projectmanager/qt4nodes.cpp
@@ -543,7 +543,7 @@ struct InternalNode
 };
 }
 
-QStringList Qt4PriFileNode::baseVPaths(QtSupport::ProFileReader *reader, const QString &projectDir)
+QStringList Qt4PriFileNode::baseVPaths(QtSupport::ProFileReader *reader, const QString &projectDir) const
 {
     QStringList result;
     if (!reader)
@@ -555,7 +555,8 @@ QStringList Qt4PriFileNode::baseVPaths(QtSupport::ProFileReader *reader, const Q
     return result;
 }
 
-QStringList Qt4PriFileNode::fullVPaths(const QStringList &baseVPaths, QtSupport::ProFileReader *reader, FileType type, const QString &qmakeVariable, const QString &projectDir)
+QStringList Qt4PriFileNode::fullVPaths(const QStringList &baseVPaths, QtSupport::ProFileReader *reader,
+                                       FileType type, const QString &qmakeVariable, const QString &projectDir) const
 {
     QStringList vPaths;
     if (!reader)
diff --git a/src/plugins/qt4projectmanager/qt4nodes.h b/src/plugins/qt4projectmanager/qt4nodes.h
index 8327bac154f..2c3ff687ea6 100644
--- a/src/plugins/qt4projectmanager/qt4nodes.h
+++ b/src/plugins/qt4projectmanager/qt4nodes.h
@@ -190,8 +190,9 @@ private:
     bool priFileWritable(const QString &path);
     bool saveModifiedEditors();
     QStringList formResources(const QString &formFile) const;
-    QStringList baseVPaths(QtSupport::ProFileReader *reader, const QString &projectDir);
-    QStringList fullVPaths(const QStringList &baseVPaths, QtSupport::ProFileReader *reader, FileType type, const QString &qmakeVariable, const QString &projectDir);
+    QStringList baseVPaths(QtSupport::ProFileReader *reader, const QString &projectDir) const;
+    QStringList fullVPaths(const QStringList &baseVPaths, QtSupport::ProFileReader *reader,
+                           FileType type, const QString &qmakeVariable, const QString &projectDir) const;
     void watchFolders(const QSet<QString> &folders);
 
     Qt4Project *m_project;