diff --git a/src/libs/utils/filepath.cpp b/src/libs/utils/filepath.cpp
index 103804b0b0c..408b41e2e3c 100644
--- a/src/libs/utils/filepath.cpp
+++ b/src/libs/utils/filepath.cpp
@@ -329,8 +329,7 @@ QString FileUtils::qmakeFriendlyName(const QString &name)
 
 bool FileUtils::makeWritable(const FilePath &path)
 {
-    const QString filePath = path.toString();
-    return QFile::setPermissions(filePath, QFile::permissions(filePath) | QFile::WriteUser);
+    return path.setPermissions(path.permissions() | QFile::WriteUser);
 }
 
 // makes sure that capitalization of directories is canonical on Windows and OS X.
diff --git a/src/plugins/coreplugin/dialogs/filepropertiesdialog.cpp b/src/plugins/coreplugin/dialogs/filepropertiesdialog.cpp
index 7c69a8ad549..63b3bbde31d 100644
--- a/src/plugins/coreplugin/dialogs/filepropertiesdialog.cpp
+++ b/src/plugins/coreplugin/dialogs/filepropertiesdialog.cpp
@@ -185,7 +185,7 @@ void FilePropertiesDialog::setPermission(QFile::Permissions newPermissions, bool
         else
             permissions &= ~newPermissions;
 
-        if (!QFile::setPermissions(m_filePath.toString(), permissions))
+        if (!m_filePath.setPermissions(permissions))
             qWarning() << "Cannot change permissions for file" << m_filePath;
     });
 
diff --git a/src/plugins/cpptools/cpptoolstestcase.cpp b/src/plugins/cpptools/cpptoolstestcase.cpp
index 9f024619581..fca2d11eed9 100644
--- a/src/plugins/cpptools/cpptoolstestcase.cpp
+++ b/src/plugins/cpptools/cpptoolstestcase.cpp
@@ -52,17 +52,20 @@
 using namespace ProjectExplorer;
 using namespace Utils;
 
+namespace CppTools {
+namespace Tests {
+
 static bool closeEditorsWithoutGarbageCollectorInvocation(const QList<Core::IEditor *> &editors)
 {
-    CppTools::CppModelManager::instance()->enableGarbageCollector(false);
+    CppModelManager::instance()->enableGarbageCollector(false);
     const bool closeEditorsSucceeded = Core::EditorManager::closeEditors(editors, false);
-    CppTools::CppModelManager::instance()->enableGarbageCollector(true);
+    CppModelManager::instance()->enableGarbageCollector(true);
     return closeEditorsSucceeded;
 }
 
 static bool snapshotContains(const CPlusPlus::Snapshot &snapshot, const QSet<QString> &filePaths)
 {
-    foreach (const QString &filePath, filePaths) {
+    for (const QString &filePath : filePaths) {
         if (!snapshot.contains(filePath)) {
             qWarning() << "Missing file in snapshot:" << qPrintable(filePath);
             return false;
@@ -71,9 +74,6 @@ static bool snapshotContains(const CPlusPlus::Snapshot &snapshot, const QSet<QSt
     return true;
 }
 
-namespace CppTools {
-namespace Tests {
-
 TestDocument::TestDocument(const QByteArray &fileName, const QByteArray &source, char cursorMarker)
     : m_fileName(QString::fromUtf8(fileName))
     , m_source(QString::fromUtf8(source))
@@ -214,7 +214,7 @@ QList<CPlusPlus::Document::Ptr> TestCase::waitForFilesInGlobalSnapshot(const QSt
     t.start();
 
     QList<CPlusPlus::Document::Ptr> result;
-    foreach (const QString &filePath, filePaths) {
+    for (const QString &filePath : filePaths) {
         forever {
             if (CPlusPlus::Document::Ptr document = globalSnapshot().document(filePath)) {
                 result.append(document);
@@ -333,8 +333,7 @@ static bool copyRecursively(const QString &sourceDirPath,
 
         // Copied files from Qt resources are read-only. Make them writable
         // so that their parent directory can be removed without warnings.
-        QFile file(targetPath.toString());
-        return file.setPermissions(file.permissions() | QFile::WriteUser);
+        return targetPath.setPermissions(targetPath.permissions() | QFile::WriteUser);
     };
 
     return Utils::FileUtils::copyRecursively(Utils::FilePath::fromString(sourceDirPath),
diff --git a/src/tools/sdktool/operation.cpp b/src/tools/sdktool/operation.cpp
index a31e6ce271e..44af491b867 100644
--- a/src/tools/sdktool/operation.cpp
+++ b/src/tools/sdktool/operation.cpp
@@ -123,8 +123,7 @@ bool Operation::save(const QVariantMap &map, const QString &file) const
                   << "." << std::endl;
         return false;
     }
-    if (!QFile::setPermissions(path.toString(),
-                               QFile::ReadOwner | QFile::WriteOwner
+    if (!path.setPermissions(QFile::ReadOwner | QFile::WriteOwner
                                | QFile::ReadGroup | QFile::ReadOther)) {
         std::cerr << "Error: Could not set permissions for " << qPrintable(path.toString())
                   << "." << std::endl;