diff --git a/app/settings/BooksSettingsPlugin.cpp b/app/settings/BooksSettingsPlugin.cpp
index f2b76b1..e22266a 100644
--- a/app/settings/BooksSettingsPlugin.cpp
+++ b/app/settings/BooksSettingsPlugin.cpp
@@ -73,6 +73,7 @@ BooksSettingsPlugin::registerTypes(
     SETTINGS_QML_REGISTER_(BooksSettingsBase, "BooksSettings");
     SETTINGS_QML_REGISTER(BooksColorSchemeModel);
     SETTINGS_QML_REGISTER(HarbourColorEditorModel);
+    qRegisterMetaType<BooksColorScheme>();
 }
 
 #include "BooksSettingsPlugin.moc"