diff --git a/Ladybird/Qt/BrowserWindow.cpp b/Ladybird/Qt/BrowserWindow.cpp
index 0b275d4be90..3e66e82b1b1 100644
--- a/Ladybird/Qt/BrowserWindow.cpp
+++ b/Ladybird/Qt/BrowserWindow.cpp
@@ -538,7 +538,7 @@ void BrowserWindow::tab_title_changed(int index, QString const& title)
         setWindowTitle(QString("%1 - Ladybird").arg(title));
 }
 
-void BrowserWindow::tab_favicon_changed(int index, QIcon icon)
+void BrowserWindow::tab_favicon_changed(int index, QIcon const& icon)
 {
     m_tabs_container->setTabIcon(index, icon);
 }
diff --git a/Ladybird/Qt/BrowserWindow.h b/Ladybird/Qt/BrowserWindow.h
index 5e526750553..981a64b231d 100644
--- a/Ladybird/Qt/BrowserWindow.h
+++ b/Ladybird/Qt/BrowserWindow.h
@@ -71,7 +71,7 @@ public:
 
 public slots:
     void tab_title_changed(int index, QString const&);
-    void tab_favicon_changed(int index, QIcon icon);
+    void tab_favicon_changed(int index, QIcon const& icon);
     Tab& new_tab(QString const&, Web::HTML::ActivateTab);
     void activate_tab(int index);
     void close_tab(int index);