diff --git a/src/plugins/debugger/debugger.qbs b/src/plugins/debugger/debugger.qbs
index 3548700b3f7..5a22105ea7a 100644
--- a/src/plugins/debugger/debugger.qbs
+++ b/src/plugins/debugger/debugger.qbs
@@ -26,6 +26,7 @@ QtcPlugin {
         "../../shared/json",
         "../../shared/registryaccess"
     ])
+    cpp.defines: base.concat(["QT_NO_CAST_FROM_ASCII"])
 
     Group {
         condition: Defaults.testsEnabled(qbs)
diff --git a/src/plugins/debugger/debuggerplugin.cpp b/src/plugins/debugger/debuggerplugin.cpp
index bbd6b33bdc3..371c7f4d492 100644
--- a/src/plugins/debugger/debuggerplugin.cpp
+++ b/src/plugins/debugger/debuggerplugin.cpp
@@ -1471,7 +1471,7 @@ bool DebuggerPluginPrivate::parseArgument(QStringList::const_iterator &it,
     // a handshake when attaching to a crashed Windows process.
     // This is created by $QTC/src/tools/qtcdebugger/main.cpp:
     // args << QLatin1String("-wincrashevent")
-    //   << QString("%1:%2").arg(argWinCrashEvent).arg(argProcessId);
+    //   << QString::fromLatin1("%1:%2").arg(argWinCrashEvent).arg(argProcessId);
     if (*it == _("-wincrashevent")) {
         ++it;
         if (it == cend) {
@@ -2215,7 +2215,7 @@ void DebuggerPluginPrivate::updateState(DebuggerEngine *engine)
     engine->watchHandler()->updateWatchersWindow();
 
     const DebuggerState state = engine->state();
-    //showMessage(QString("PLUGIN SET STATE: ")
+    //showMessage(QString::fromLatin1("PLUGIN SET STATE: ")
     //    + DebuggerEngine::stateName(state), LogStatus);
     //qDebug() << "PLUGIN SET STATE: " << state;
 
diff --git a/src/plugins/debugger/qml/qmlinspectoragent.cpp b/src/plugins/debugger/qml/qmlinspectoragent.cpp
index 1573a9cdb0b..cafbe8d243a 100644
--- a/src/plugins/debugger/qml/qmlinspectoragent.cpp
+++ b/src/plugins/debugger/qml/qmlinspectoragent.cpp
@@ -333,7 +333,7 @@ bool QmlInspectorAgent::addObjectWatch(int objectDebugId)
         return true;
 
     // is flooding the debugging output log!
-    // log(LogSend, QString("WATCH_PROPERTY %1").arg(objectDebugId));
+    // log(LogSend, QString::fromLatin1("WATCH_PROPERTY %1").arg(objectDebugId));
 
     if (m_engineClient->addWatch(objectDebugId))
         m_objectWatches.append(objectDebugId);