diff --git a/src/plugins/valgrind/callgrind/callgrindcontroller.cpp b/src/plugins/valgrind/callgrind/callgrindcontroller.cpp
index c68b1946179..07cccf0e334 100644
--- a/src/plugins/valgrind/callgrind/callgrindcontroller.cpp
+++ b/src/plugins/valgrind/callgrind/callgrindcontroller.cpp
@@ -200,7 +200,7 @@ void CallgrindController::getLocalDataFile()
             arg(m_valgrindProc->pid());
     const QString workingDir = m_valgrindProc->workingDirectory();
     // first, set the to-be-parsed file to callgrind.out.PID
-    QString fileName = workingDir.isEmpty() ? baseFileName : (workingDir + QDir::separator() + baseFileName);
+    QString fileName = workingDir.isEmpty() ? baseFileName : (workingDir + QLatin1Char('/') + baseFileName);
 
     if (!m_valgrindProc->isLocal()) {
         ///TODO: error handling
@@ -217,7 +217,7 @@ void CallgrindController::getLocalDataFile()
         QStringList outputFiles = dir.entryList();
         // if there are files like callgrind.out.PID.NUM, set it to the most recent one of those
         if (!outputFiles.isEmpty())
-            fileName = workingDir + QDir::separator() + dir.entryList().first();
+            fileName = workingDir + QLatin1Char('/') + dir.entryList().first();
 
         emit localParseDataAvailable(fileName);
     }
@@ -237,7 +237,7 @@ void CallgrindController::foundRemoteFile()
 void CallgrindController::sftpInitialized()
 {
     cleanupTempFile();
-    QTemporaryFile dataFile(QDir::tempPath() + QDir::separator() + QLatin1String("callgrind.out."));
+    QTemporaryFile dataFile(QDir::tempPath() + QLatin1Char('/') + QLatin1String("callgrind.out."));
     QTC_ASSERT(dataFile.open(), return);
     m_tempDataFile = dataFile.fileName();
     dataFile.setAutoRemove(false);
diff --git a/src/plugins/valgrind/memcheckerrorview.cpp b/src/plugins/valgrind/memcheckerrorview.cpp
index 69a0803fbdc..263a7b1f741 100644
--- a/src/plugins/valgrind/memcheckerrorview.cpp
+++ b/src/plugins/valgrind/memcheckerrorview.cpp
@@ -92,7 +92,7 @@ static QString makeFrameName(const Frame &frame, const QString &relativeTo,
     const QString d = frame.directory();
     const QString f = frame.file();
     const QString fn = frame.functionName();
-    const QString fullPath = d + QDir::separator() + f;
+    const QString fullPath = d + QLatin1Char('/') + f;
 
     QString path;
     if (!d.isEmpty() && !f.isEmpty())
@@ -109,12 +109,12 @@ static QString makeFrameName(const Frame &frame, const QString &relativeTo,
     if (frame.line() != -1)
         path += QLatin1Char(':') + QString::number(frame.line());
 
-    path = path.toHtmlEscaped();
+    path = QDir::toNativeSeparators(path.toHtmlEscaped());
 
     if (link && !f.isEmpty() && QFile::exists(fullPath)) {
         // make a hyperlink label
         path = QString::fromLatin1("<a href=\"file://%1:%2\" %4>%3</a>")
-                    .arg(fullPath, QString::number(frame.line()), path, linkAttr);
+                .arg(fullPath).arg(frame.line()).arg(path).arg(linkAttr);
     }
 
     if (!fn.isEmpty())
@@ -130,8 +130,9 @@ static QString relativeToPath()
     const ProjectExplorer::Project *project = ProjectExplorer::SessionManager::startupProject();
 
     QString relativeTo(project ? project->projectDirectory().toString() : QDir::homePath());
-    if (!relativeTo.endsWith(QDir::separator()))
-        relativeTo.append(QDir::separator());
+    const QChar slash = QLatin1Char('/');
+    if (!relativeTo.endsWith(slash))
+        relativeTo.append(slash);
 
     return relativeTo;
 }
diff --git a/src/plugins/valgrind/memchecktool.cpp b/src/plugins/valgrind/memchecktool.cpp
index 84cc977fe30..9deb62f3296 100644
--- a/src/plugins/valgrind/memchecktool.cpp
+++ b/src/plugins/valgrind/memchecktool.cpp
@@ -455,7 +455,7 @@ void MemcheckTool::engineStarting(const AnalyzerRunControl *engine)
 
     QString dir;
     if (RunConfiguration *rc = engine->runConfiguration())
-        dir = rc->target()->project()->projectDirectory().toString() + QDir::separator();
+        dir = rc->target()->project()->projectDirectory().toString() + QLatin1Char('/');
 
     const MemcheckRunControl *mEngine = dynamic_cast<const MemcheckRunControl *>(engine);
     QTC_ASSERT(mEngine, return);
diff --git a/src/plugins/valgrind/xmlprotocol/errorlistmodel.cpp b/src/plugins/valgrind/xmlprotocol/errorlistmodel.cpp
index 335d38ded9c..20d641bec12 100644
--- a/src/plugins/valgrind/xmlprotocol/errorlistmodel.cpp
+++ b/src/plugins/valgrind/xmlprotocol/errorlistmodel.cpp
@@ -113,7 +113,7 @@ QString ErrorListModel::Private::formatAbsoluteFilePath(const Error &error) cons
 {
     const Frame f = findRelevantFrame(error);
     if (!f.directory().isEmpty() && !f.file().isEmpty())
-        return QString(f.directory() + QDir::separator() + f.file());
+        return f.directory() + QLatin1Char('/') + f.file();
     return QString();
 }
 
diff --git a/src/plugins/valgrind/xmlprotocol/modelhelpers.cpp b/src/plugins/valgrind/xmlprotocol/modelhelpers.cpp
index 5929a76d388..393b5c9ed47 100644
--- a/src/plugins/valgrind/xmlprotocol/modelhelpers.cpp
+++ b/src/plugins/valgrind/xmlprotocol/modelhelpers.cpp
@@ -44,7 +44,7 @@ QString toolTipForFrame(const Frame &frame)
 {
     QString location;
     if (!frame.file().isEmpty()) {
-        location = frame.directory() + QDir::separator() + frame.file();
+        location = frame.directory() + QLatin1Char('/') + frame.file();
         if (frame.line() > 0)
             location += QLatin1Char(':') + QString::number(frame.line());
     }
diff --git a/src/plugins/valgrind/xmlprotocol/stackmodel.cpp b/src/plugins/valgrind/xmlprotocol/stackmodel.cpp
index 68b7f8ad49f..abd95c4a421 100644
--- a/src/plugins/valgrind/xmlprotocol/stackmodel.cpp
+++ b/src/plugins/valgrind/xmlprotocol/stackmodel.cpp
@@ -65,8 +65,8 @@ static QString makeName(const Frame &frame)
     if (!fn.isEmpty())
         return fn;
     if (!d.isEmpty() && !f.isEmpty())
-        return frame.line() > 0 ? QString::fromLatin1("%1%2%3:%4").arg(d, QDir::separator(), f, QString::number(frame.line()))
-                                : QString::fromLatin1("%1%2%3").arg(d, QDir::separator(), f);
+        return frame.line() > 0 ? QString::fromLatin1("%1/%2:%3").arg(d, f).arg(frame.line())
+                                : QString::fromLatin1("%1/%2").arg(d, f);
     return frame.object();
 }
 
diff --git a/tests/auto/valgrind/memcheck/testrunner.cpp b/tests/auto/valgrind/memcheck/testrunner.cpp
index 344a1a75433..317743ab872 100644
--- a/tests/auto/valgrind/memcheck/testrunner.cpp
+++ b/tests/auto/valgrind/memcheck/testrunner.cpp
@@ -58,7 +58,7 @@ bool on64bit()
 
 QString srcDirForApp(const QString &app)
 {
-    return appSrcDir + QDir::separator() + app;
+    return appSrcDir + QLatin1Char('/') + app;
 }
 
 QTEST_MAIN(Valgrind::TestRunner)
@@ -79,7 +79,7 @@ TestRunner::TestRunner(QObject *parent)
 
 QString TestRunner::runTestBinary(const QString &binary, const QStringList &vArgs)
 {
-    const QString binPath = appBinDir + QDir::separator() + binary;
+    const QString binPath = appBinDir + QLatin1Char('/') + binary;
     if (!QFileInfo(binPath).isExecutable())
         qFatal("No such test app: %s", qPrintable(binPath));
     m_runner->setValgrindArguments(QStringList() << "--num-callers=50" << "--track-origins=yes" << vArgs);
@@ -263,7 +263,7 @@ void TestRunner::testLeak3()
 void TestRunner::testLeak4()
 {
     const QString app("leak4");
-    const QString binary = runTestBinary(app + QDir::separator() + app,
+    const QString binary = runTestBinary(app + QLatin1Char('/') + app,
                                          QStringList() << "--show-reachable=yes");
     const QString srcDir = srcDirForApp("leak4");
 
@@ -341,7 +341,7 @@ void TestRunner::testLeak4()
 void TestRunner::uninit1()
 {
     const QString app("uninit1");
-    const QString binary = runTestBinary(app + QDir::separator() + app);
+    const QString binary = runTestBinary(app + QLatin1Char('/') + app);
     const QString srcDir = srcDirForApp(app);
 
     QVERIFY(m_logMessages.isEmpty());
@@ -384,7 +384,7 @@ void TestRunner::uninit2()
 {
     const QString app("uninit2");
     m_expectCrash = true;
-    const QString binary = runTestBinary(app + QDir::separator() + app);
+    const QString binary = runTestBinary(app + QLatin1Char('/') + app);
     const QString srcDir = srcDirForApp(app);
 
     QVERIFY(m_logMessages.isEmpty());
@@ -448,7 +448,7 @@ void TestRunner::uninit3()
 {
     const QString app("uninit3");
     m_expectCrash = true;
-    const QString binary = runTestBinary(app + QDir::separator() + app);
+    const QString binary = runTestBinary(app + QLatin1Char('/') + app);
     const QString srcDir = srcDirForApp(app);
 
     QVERIFY(m_logMessages.isEmpty());
@@ -511,7 +511,7 @@ void TestRunner::uninit3()
 void TestRunner::syscall()
 {
     const QString app("syscall");
-    const QString binary = runTestBinary(app + QDir::separator() + app);
+    const QString binary = runTestBinary(app + QLatin1Char('/') + app);
     const QString srcDir = srcDirForApp(app);
 
     QVERIFY(m_logMessages.isEmpty());
@@ -570,7 +570,7 @@ void TestRunner::syscall()
 void TestRunner::free1()
 {
     const QString app("free1");
-    const QString binary = runTestBinary(app + QDir::separator() + app);
+    const QString binary = runTestBinary(app + QLatin1Char('/') + app);
     const QString srcDir = srcDirForApp(app);
 
     QVERIFY(m_logMessages.isEmpty());
@@ -624,7 +624,7 @@ void TestRunner::free1()
 void TestRunner::free2()
 {
     const QString app("free2");
-    const QString binary = runTestBinary(app + QDir::separator() + app);
+    const QString binary = runTestBinary(app + QLatin1Char('/') + app);
     const QString srcDir = srcDirForApp(app);
 
     QVERIFY(m_logMessages.isEmpty());
@@ -683,7 +683,7 @@ void TestRunner::invalidjump()
 {
     const QString app("invalidjump");
     m_expectCrash = true;
-    const QString binary = runTestBinary(app + QDir::separator() + app);
+    const QString binary = runTestBinary(app + QLatin1Char('/') + app);
     const QString srcDir = srcDirForApp(app);
 
     QVERIFY(m_logMessages.isEmpty());
@@ -711,7 +711,7 @@ void TestRunner::overlap()
 {
     const QString app("overlap");
     m_expectCrash = true;
-    const QString binary = runTestBinary(app + QDir::separator() + app);
+    const QString binary = runTestBinary(app + QLatin1Char('/') + app);
     const QString srcDir = srcDirForApp(app);
 
     QVERIFY(m_logMessages.isEmpty());