diff --git a/Userland/Applications/PixelPaint/LayerPropertiesWidget.cpp b/Userland/Applications/PixelPaint/LayerPropertiesWidget.cpp
index 74418c7c7b5..eb7e83342fd 100644
--- a/Userland/Applications/PixelPaint/LayerPropertiesWidget.cpp
+++ b/Userland/Applications/PixelPaint/LayerPropertiesWidget.cpp
@@ -64,6 +64,8 @@ LayerPropertiesWidget::LayerPropertiesWidget()
     };
 }
 
+LayerPropertiesWidget::~LayerPropertiesWidget() = default;
+
 void LayerPropertiesWidget::set_layer(Layer* layer)
 {
     if (m_layer == layer)
diff --git a/Userland/Applications/PixelPaint/LayerPropertiesWidget.h b/Userland/Applications/PixelPaint/LayerPropertiesWidget.h
index 714da7ed497..45a4be67900 100644
--- a/Userland/Applications/PixelPaint/LayerPropertiesWidget.h
+++ b/Userland/Applications/PixelPaint/LayerPropertiesWidget.h
@@ -17,7 +17,7 @@ class LayerPropertiesWidget final : public GUI::Widget {
     C_OBJECT(LayerPropertiesWidget);
 
 public:
-    virtual ~LayerPropertiesWidget() override = default;
+    virtual ~LayerPropertiesWidget() override;
 
     void set_layer(Layer*);
 
diff --git a/Userland/Applications/PixelPaint/PaletteWidget.cpp b/Userland/Applications/PixelPaint/PaletteWidget.cpp
index 849c0703556..ed12cf35d41 100644
--- a/Userland/Applications/PixelPaint/PaletteWidget.cpp
+++ b/Userland/Applications/PixelPaint/PaletteWidget.cpp
@@ -140,6 +140,8 @@ PaletteWidget::PaletteWidget()
     display_color_list(result.value());
 }
 
+PaletteWidget::~PaletteWidget() = default;
+
 void PaletteWidget::set_image_editor(ImageEditor* editor)
 {
     m_editor = editor;
diff --git a/Userland/Applications/PixelPaint/PaletteWidget.h b/Userland/Applications/PixelPaint/PaletteWidget.h
index 7825290fe07..a6c74f43a4e 100644
--- a/Userland/Applications/PixelPaint/PaletteWidget.h
+++ b/Userland/Applications/PixelPaint/PaletteWidget.h
@@ -22,7 +22,7 @@ class PaletteWidget final : public GUI::Frame {
     C_OBJECT(PaletteWidget);
 
 public:
-    virtual ~PaletteWidget() override = default;
+    virtual ~PaletteWidget() override;
 
     void set_primary_color(Color);
     void set_secondary_color(Color);
diff --git a/Userland/Applications/PixelPaint/ToolPropertiesWidget.cpp b/Userland/Applications/PixelPaint/ToolPropertiesWidget.cpp
index aea43ae9a04..e76b786bafd 100644
--- a/Userland/Applications/PixelPaint/ToolPropertiesWidget.cpp
+++ b/Userland/Applications/PixelPaint/ToolPropertiesWidget.cpp
@@ -26,6 +26,8 @@ ToolPropertiesWidget::ToolPropertiesWidget()
     m_error_label->set_enabled(false);
 }
 
+ToolPropertiesWidget::~ToolPropertiesWidget() = default;
+
 void ToolPropertiesWidget::set_active_tool(Tool* tool)
 {
     if (tool == m_active_tool)
diff --git a/Userland/Applications/PixelPaint/ToolPropertiesWidget.h b/Userland/Applications/PixelPaint/ToolPropertiesWidget.h
index 3bea69987ac..7a2d1f16bcd 100644
--- a/Userland/Applications/PixelPaint/ToolPropertiesWidget.h
+++ b/Userland/Applications/PixelPaint/ToolPropertiesWidget.h
@@ -20,7 +20,7 @@ class ToolPropertiesWidget final : public GUI::Widget {
     C_OBJECT(ToolPropertiesWidget);
 
 public:
-    virtual ~ToolPropertiesWidget() override = default;
+    virtual ~ToolPropertiesWidget() override;
 
     void set_active_tool(Tool*);
 
diff --git a/Userland/Libraries/LibGUI/MultiView.cpp b/Userland/Libraries/LibGUI/MultiView.cpp
index 59a7bb9b860..176d705ccab 100644
--- a/Userland/Libraries/LibGUI/MultiView.cpp
+++ b/Userland/Libraries/LibGUI/MultiView.cpp
@@ -50,6 +50,8 @@ MultiView::MultiView()
     set_view_mode(ViewMode::Icon);
 }
 
+MultiView::~MultiView() = default;
+
 void MultiView::set_view_mode(ViewMode mode)
 {
     if (m_view_mode == mode)
diff --git a/Userland/Libraries/LibGUI/MultiView.h b/Userland/Libraries/LibGUI/MultiView.h
index b7f44fdae8d..532b25fe346 100644
--- a/Userland/Libraries/LibGUI/MultiView.h
+++ b/Userland/Libraries/LibGUI/MultiView.h
@@ -18,7 +18,7 @@ namespace GUI {
 class MultiView final : public GUI::StackWidget {
     C_OBJECT(MultiView)
 public:
-    virtual ~MultiView() override = default;
+    virtual ~MultiView() override;
 
     Function<void()> on_selection_change;
     Function<void(ModelIndex const&)> on_activation;