diff --git a/src/gui/query/editor_closed_query.h b/src/gui/query/editor_closed_query.h
index 7ff046fc..5a311726 100644
--- a/src/gui/query/editor_closed_query.h
+++ b/src/gui/query/editor_closed_query.h
@@ -148,7 +148,7 @@ private:
       return "null";
   }
 
-  static std::vector<Message> toMessages(std::vector<EditorMessage> messages) {
+  static std::vector<Message> toMessages(const std::vector<EditorMessage>& messages) {
     std::vector<Message> list;
 
     for (const auto& message : messages) {
diff --git a/src/gui/query/get_game_data_query.h b/src/gui/query/get_game_data_query.h
index c21179eb..91e64297 100644
--- a/src/gui/query/get_game_data_query.h
+++ b/src/gui/query/get_game_data_query.h
@@ -67,7 +67,7 @@ public:
   }
 
 private:
-  static std::vector<EditorMessage> toEditorMessages(std::vector<Message> messages, const LanguageCode language) {
+  static std::vector<EditorMessage> toEditorMessages(const std::vector<Message>& messages, const LanguageCode language) {
     std::vector<EditorMessage> list;
 
     for (const auto& message : messages) {
@@ -129,7 +129,7 @@ private:
     return pluginNode;
   }
 
-  std::string generateJsonResponse(std::vector<std::shared_ptr<const PluginInterface>> plugins) {
+  std::string generateJsonResponse(const std::vector<std::shared_ptr<const PluginInterface>>& plugins) {
     YAML::Node gameNode;
 
     // ID the game using its folder value.