--- a/widget/gtk/WidgetStyleCache.cpp
+++ b/widget/gtk/WidgetStyleCache.cpp
@@ -667,16 +667,23 @@ CreateWidget(WidgetNodeType aWidgetType)
     case MOZ_GTK_COMBOBOX_ENTRY:
       return CreateComboBoxEntryWidget();
     case MOZ_GTK_COMBOBOX_ENTRY_TEXTAREA:
       return CreateComboBoxEntryTextareaWidget();
     case MOZ_GTK_COMBOBOX_ENTRY_BUTTON:
       return CreateComboBoxEntryButtonWidget();
     case MOZ_GTK_COMBOBOX_ENTRY_ARROW:
       return CreateComboBoxEntryArrowWidget();
+    case MOZ_GTK_HEADER_BAR:
+    case MOZ_GTK_HEADER_BAR_MAXIMIZED:
+      return CreateHeaderBar(aWidgetType);
+    case MOZ_GTK_HEADER_BAR_BUTTON_CLOSE:
+    case MOZ_GTK_HEADER_BAR_BUTTON_MINIMIZE:
+    case MOZ_GTK_HEADER_BAR_BUTTON_MAXIMIZE:
+      return CreateHeaderBarButton(aWidgetType);
     default:
       /* Not implemented */
       return nullptr;
   }
 }
 
 GtkWidget*
 GetWidget(WidgetNodeType aWidgetType)