diff --git a/src/plugins/genericprojectmanager/genericprojectnodes.cpp b/src/plugins/genericprojectmanager/genericprojectnodes.cpp
index 91198bde29e857d041ace2cc70d63822b87f771b..74c51ec7dc7a56d0856fdefdf6a225a590da6800 100644
--- a/src/plugins/genericprojectmanager/genericprojectnodes.cpp
+++ b/src/plugins/genericprojectmanager/genericprojectnodes.cpp
@@ -57,7 +57,7 @@ QString GenericProjectNode::projectFilePath() const
     return m_projectFile->filePath();
 }
 
-QHash<QString, QStringList> sortFilesIntoPaths(const QString &base, const QSet<QString> files)
+QHash<QString, QStringList> sortFilesIntoPaths(const QString &base, const QSet<QString> &files)
 {
     QHash<QString, QStringList> filesInPath;
     const QDir baseDir(base);