diff --git a/kcm/src/declarative/qmlscreen.h b/kcm/src/declarative/qmlscreen.h
--- a/kcm/src/declarative/qmlscreen.h
+++ b/kcm/src/declarative/qmlscreen.h
@@ -57,6 +57,7 @@
 
   public:
     explicit QMLScreen(QQuickItem *parent = nullptr);
+    ~QMLScreen() override;
 
     int connectedOutputsCount() const;
     int enabledOutputsCount() const;
diff --git a/kcm/src/declarative/qmlscreen.cpp b/kcm/src/declarative/qmlscreen.cpp
--- a/kcm/src/declarative/qmlscreen.cpp
+++ b/kcm/src/declarative/qmlscreen.cpp
@@ -34,6 +34,12 @@
     connect(this, &QMLScreen::heightChanged, this, &QMLScreen::viewSizeChanged);
 }
 
+QMLScreen::~QMLScreen()
+{
+    qDeleteAll(m_outputMap);
+    m_outputMap.clear();
+}
+
 KScreen::ConfigPtr QMLScreen::config() const
 {
     return m_config;