diff --git a/src/gui/user_interface.cpp b/src/gui/user_interface.cpp
index ff30701..f77e228 100644
--- a/src/gui/user_interface.cpp
+++ b/src/gui/user_interface.cpp
@@ -121,7 +121,7 @@ user_interface::user_interface()
     set_child(*vertical_box);
 }
 
-std::vector<Glib::ustring> user_interface::get_translator() {
+const std::vector<Glib::ustring> user_interface::get_translator() {
     return {"Stub", "DeepL", "Mozhi", "LibreTranslate", "Lingva Translate"};
 }
 
diff --git a/src/gui/user_interface.h b/src/gui/user_interface.h
index 7b368aa..e0fabb3 100644
--- a/src/gui/user_interface.h
+++ b/src/gui/user_interface.h
@@ -31,8 +31,8 @@ namespace bot {
         class user_interface : public Gtk::Window {
         public:
             explicit user_interface();
-            std::vector<Glib::ustring> get_translator();
-            const char* get_translator_name(guint translator_id);
+            static const std::vector<Glib::ustring> get_translator();
+            static const char* get_translator_name(guint translator_id);
             void log_append(const std::string &message, const std::string &type = "Log", bool is_error = false);
             void log_scroll_down();
             void run();