diff --git a/QtSLiM/QtSLiMVariableBrowser.cpp b/QtSLiM/QtSLiMVariableBrowser.cpp
index 3dff9386..1c6b2543 100644
--- a/QtSLiM/QtSLiMVariableBrowser.cpp
+++ b/QtSLiM/QtSLiMVariableBrowser.cpp
@@ -535,7 +535,7 @@ void QtSLiMVariableBrowser::itemExpanded(QTreeWidgetItem *item)
             // we used to display zero-length property values for zero-length object vectors, but don't any more
             int display_index = (element_index != -1) ? element_index : 0;
             EidosValue_Object *eidos_object_vector = static_cast<EidosValue_Object *>(eidos_value);
-            EidosObject *eidos_object = eidos_object_vector->ObjectElementAtIndex(display_index, nullptr);
+            EidosObject *eidos_object = eidos_object_vector->ObjectElementAtIndex_NOCAST(display_index, nullptr);
 			const EidosClass *object_class = eidos_object->Class();
 			const std::vector<EidosPropertySignature_CSP> *properties = object_class->Properties();
 			size_t propertyCount = properties->size();
diff --git a/QtSLiM/QtSLiM_SLiMgui.cpp b/QtSLiM/QtSLiM_SLiMgui.cpp
index 156a6b13..3f56b716 100644
--- a/QtSLiM/QtSLiM_SLiMgui.cpp
+++ b/QtSLiM/QtSLiM_SLiMgui.cpp
@@ -113,7 +113,7 @@ EidosValue_SP SLiMgui::ExecuteMethod_openDocument(EidosGlobalStringID p_method_i
 #pragma unused (p_method_id, p_arguments, p_interpreter)
 	
 	EidosValue *filePath_value = p_arguments[0].get();
-	std::string file_path = Eidos_ResolvedPath(Eidos_StripTrailingSlash(filePath_value->StringAtIndex(0, nullptr)));
+	std::string file_path = Eidos_ResolvedPath(Eidos_StripTrailingSlash(filePath_value->StringAtIndex_NOCAST(0, nullptr)));
 	QString filePath = QString::fromStdString(file_path);
 	
 	controller_->eidos_openDocument(filePath);