diff --git a/YACReaderLibrary/properties_dialog.cpp b/YACReaderLibrary/properties_dialog.cpp
index 1846820c..fd1011bd 100644
--- a/YACReaderLibrary/properties_dialog.cpp
+++ b/YACReaderLibrary/properties_dialog.cpp
@@ -69,7 +69,7 @@ PropertiesDialog::PropertiesDialog(QWidget *parent)
     mainWidget->move(280, 0);
 }
 
-QSize PropertiesDialog::sizeHint()
+QSize PropertiesDialog::sizeHint() const
 {
     return QSize(750, 444);
 }
diff --git a/YACReaderLibrary/properties_dialog.h b/YACReaderLibrary/properties_dialog.h
index 9d086217..ee4242f1 100644
--- a/YACReaderLibrary/properties_dialog.h
+++ b/YACReaderLibrary/properties_dialog.h
@@ -125,7 +125,7 @@ public:
     // TODO: this non-const member function hides rather than overrides
     // QWidget::sizeHint(). But the function cannot be simply removed as it is used
     // in our constructor. Will have to investigate and decide how to fix this.
-    QSize sizeHint();
+    QSize sizeHint() const override;
     void paintEvent(QPaintEvent *event) override;
 
 public slots: