diff --git a/abstract_client.h b/abstract_client.h
--- a/abstract_client.h
+++ b/abstract_client.h
@@ -94,7 +94,7 @@
     /**
      * The x11 ids for all desktops this client is in. On X11 this list will always have a length of 1
      **/
-    Q_PROPERTY(QList<int> x11DesktopIds READ x11DesktopIds NOTIFY x11DesktopIdsChanged)
+    Q_PROPERTY(QVector<int> x11DesktopIds READ x11DesktopIds NOTIFY x11DesktopIdsChanged)
     /**
      * Indicates that the window should not be included on a taskbar.
      **/
@@ -432,13 +432,13 @@
     int desktop() const override {
         return m_desktops.isEmpty() ? (int)NET::OnAllDesktops : m_desktops.last()->x11DesktopNumber();
     }
-    virtual QList<VirtualDesktop *> desktops() const {
+    virtual QVector<VirtualDesktop *> desktops() const {
         return m_desktops;
     }
     void removeDesktop(VirtualDesktop *desktop) {
         m_desktops.removeAll(desktop);
     }
-    QList<int> x11DesktopIds() const;
+    QVector<int> x11DesktopIds() const;
 
     void setMinimized(bool set);
     /**
@@ -1122,7 +1122,7 @@
     bool m_demandsAttention = false;
     bool m_minimized = false;
     QTimer *m_autoRaiseTimer = nullptr;
-    QList <VirtualDesktop *> m_desktops;
+    QVector <VirtualDesktop *> m_desktops;
 
     QString m_colorScheme;
     std::shared_ptr<Decoration::DecorationPalette> m_palette;
diff --git a/abstract_client.cpp b/abstract_client.cpp
--- a/abstract_client.cpp
+++ b/abstract_client.cpp
@@ -602,10 +602,10 @@
         setDesktop(VirtualDesktopManager::self()->current());
 }
 
-QList<int> AbstractClient::x11DesktopIds() const
+QVector<int> AbstractClient::x11DesktopIds() const
 {
     const auto desks = desktops();
-    QList<int> x11Ids;
+    QVector<int> x11Ids;
     x11Ids.reserve(desks.count());
     std::transform(desks.constBegin(), desks.constEnd(),
         std::back_inserter(x11Ids),
diff --git a/deleted.h b/deleted.h
--- a/deleted.h
+++ b/deleted.h
@@ -52,7 +52,7 @@
     void discard();
     virtual int desktop() const;
     virtual QStringList activities() const;
-    virtual QList<VirtualDesktop *> desktops() const;
+    virtual QVector<VirtualDesktop *> desktops() const;
     virtual QPoint clientPos() const;
     virtual QSize clientSize() const;
     QPoint clientContentPos() const override {
@@ -196,7 +196,7 @@
     QPoint m_contentPos;
     QRect transparent_rect;
     xcb_window_t m_frame;
-    QList <VirtualDesktop *> m_desktops;
+    QVector <VirtualDesktop *> m_desktops;
 
     bool no_border;
     QRect decoration_left;
diff --git a/deleted.cpp b/deleted.cpp
--- a/deleted.cpp
+++ b/deleted.cpp
@@ -165,7 +165,7 @@
     return activityList;
 }
 
-QList<VirtualDesktop *> Deleted::desktops() const
+QVector<VirtualDesktop *> Deleted::desktops() const
 {
     return m_desktops;
 }
diff --git a/toplevel.h b/toplevel.h
--- a/toplevel.h
+++ b/toplevel.h
@@ -290,7 +290,7 @@
      * isOnDesktop() instead.
      */
     virtual int desktop() const = 0;
-    virtual QList<VirtualDesktop *> desktops() const = 0;
+    virtual QVector<VirtualDesktop *> desktops() const = 0;
     virtual QStringList activities() const = 0;
     bool isOnDesktop(int d) const;
     bool isOnActivity(const QString &activity) const;
diff --git a/unmanaged.h b/unmanaged.h
--- a/unmanaged.h
+++ b/unmanaged.h
@@ -39,7 +39,7 @@
     static void deleteUnmanaged(Unmanaged* c);
     virtual int desktop() const;
     virtual QStringList activities() const;
-    virtual QList<VirtualDesktop *> desktops() const override;
+    virtual QVector<VirtualDesktop *> desktops() const override;
     virtual QPoint clientPos() const;
     virtual QSize clientSize() const;
     virtual QRect transparentRect() const;
diff --git a/unmanaged.cpp b/unmanaged.cpp
--- a/unmanaged.cpp
+++ b/unmanaged.cpp
@@ -123,9 +123,9 @@
     return QStringList();
 }
 
-QList<VirtualDesktop *> Unmanaged::desktops() const
+QVector<VirtualDesktop *> Unmanaged::desktops() const
 {
-    return QList<VirtualDesktop *>();
+    return QVector<VirtualDesktop *>();
 }
 
 QPoint Unmanaged::clientPos() const