diff --git a/src/DockWidgetBase.cpp b/src/DockWidgetBase.cpp
index b67ed811..fd770789 100644
--- a/src/DockWidgetBase.cpp
+++ b/src/DockWidgetBase.cpp
@@ -133,6 +133,7 @@ public:
     bool m_updatingToggleAction = false;
     bool m_updatingFloatAction = false;
     bool m_isForceClosing = false;
+    QSize m_lastOverlayedSize = QSize(0, 0);
 };
 
 DockWidgetBase::DockWidgetBase(const QString &name, Options options)
@@ -517,6 +518,11 @@ bool DockWidgetBase::hasPreviousDockedLocation() const
     return d->m_lastPositions.isValid();
 }
 
+QSize DockWidgetBase::lastOverlayedSize() const
+{
+    return d->m_lastOverlayedSize;
+}
+
 FloatingWindow *DockWidgetBase::morphIntoFloatingWindow()
 {
     qCDebug(creation) << "DockWidget::morphIntoFloatingWindow() this=" << this
@@ -796,6 +802,19 @@ void DockWidgetBase::onHidden(bool spontaneous)
     }
 }
 
+bool DockWidgetBase::onResize(QSize newSize)
+{
+    if (isOverlayed()) {
+        if (auto frame = this->frame()) {
+            d->m_lastOverlayedSize = frame->QWidgetAdapter::size();
+        } else {
+            qWarning() << Q_FUNC_INFO << "Overlayed dock widget without frame shouldn't happen";
+        }
+    }
+
+    return QWidgetAdapter::onResize(newSize);
+}
+
 void DockWidgetBase::onCloseEvent(QCloseEvent *e)
 {
     e->accept(); // By default we accept, means DockWidget closes
diff --git a/src/DockWidgetBase.h b/src/DockWidgetBase.h
index f151134e..8bdaa33b 100644
--- a/src/DockWidgetBase.h
+++ b/src/DockWidgetBase.h
@@ -440,6 +440,10 @@ public:
     /// When you call dockWidget->setFloating(false) it will only dock if it knows where to.
     bool hasPreviousDockedLocation() const;
 
+    /// @brief returns the last size the widget has when overlayed
+    /// Empty otherwise
+    QSize lastOverlayedSize() const;
+
 Q_SIGNALS:
     ///@brief signal emitted when the parent changed
     void parentChanged();
@@ -491,6 +495,8 @@ protected:
     void onParentChanged();
     void onShown(bool spontaneous);
     void onHidden(bool spontaneous);
+    bool onResize(QSize newSize) override;
+
 #ifndef PYTHON_BINDINGS //Pyside bug: https://bugreports.qt.io/projects/PYSIDE/issues/PYSIDE-1327
     void onCloseEvent(QCloseEvent *e) override;
 #endif