diff --git a/Userland/Libraries/LibGUI/CMakeLists.txt b/Userland/Libraries/LibGUI/CMakeLists.txt
index 1648dc9634..026acc0966 100644
--- a/Userland/Libraries/LibGUI/CMakeLists.txt
+++ b/Userland/Libraries/LibGUI/CMakeLists.txt
@@ -62,6 +62,7 @@ set(SOURCES
     ListView.cpp
     Menu.cpp
     MenuItem.cpp
+    Menubar.cpp
     MessageBox.cpp
     Model.cpp
     ModelIndex.cpp
diff --git a/Userland/Libraries/LibGUI/Menubar.cpp b/Userland/Libraries/LibGUI/Menubar.cpp
new file mode 100644
index 0000000000..69fdb27f13
--- /dev/null
+++ b/Userland/Libraries/LibGUI/Menubar.cpp
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibGUI/Menubar.h>
+
+namespace GUI {
+
+Menubar::Menubar()
+{
+}
+
+Menubar::~Menubar()
+{
+}
+
+ErrorOr<NonnullRefPtr<Menu>> Menubar::try_add_menu(Badge<Window>, String name)
+{
+    auto menu = TRY(try_add<Menu>(move(name)));
+    TRY(m_menus.try_append(menu));
+    return menu;
+}
+
+Menu& Menubar::add_menu(Badge<Window>, String name)
+{
+    auto& menu = add<Menu>(move(name));
+    m_menus.append(menu);
+    return menu;
+}
+
+void Menubar::for_each_menu(Function<IterationDecision(Menu&)> callback)
+{
+    for (auto& menu : m_menus) {
+        if (callback(menu) == IterationDecision::Break) {
+            return;
+        }
+    }
+}
+
+}
diff --git a/Userland/Libraries/LibGUI/Menubar.h b/Userland/Libraries/LibGUI/Menubar.h
index 42d97b7b91..71e1b35416 100644
--- a/Userland/Libraries/LibGUI/Menubar.h
+++ b/Userland/Libraries/LibGUI/Menubar.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
  * Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
@@ -20,26 +20,15 @@ class Menubar : public Core::Object {
     C_OBJECT(Menubar);
 
 public:
-    ~Menubar() { }
+    virtual ~Menubar() override;
 
-    Menu& add_menu(Badge<Window>, String name)
-    {
-        auto& menu = add<Menu>(move(name));
-        m_menus.append(menu);
-        return menu;
-    }
+    ErrorOr<NonnullRefPtr<Menu>> try_add_menu(Badge<Window>, String name);
+    Menu& add_menu(Badge<Window>, String name);
 
-    void for_each_menu(Function<IterationDecision(Menu&)> callback)
-    {
-        for (auto& menu : m_menus) {
-            if (callback(menu) == IterationDecision::Break) {
-                return;
-            }
-        }
-    }
+    void for_each_menu(Function<IterationDecision(Menu&)>);
 
 private:
-    Menubar() { }
+    Menubar();
 
     NonnullRefPtrVector<Menu> m_menus;
 };