diff --git a/screen_ui.cpp b/screen_ui.cpp
index c0fb2cf..f5dadf7 100644
--- a/screen_ui.cpp
+++ b/screen_ui.cpp
@@ -751,7 +751,7 @@
   return true;
 }
 
-std::string ScreenRecoveryUI::GetLocale() {
+std::string ScreenRecoveryUI::GetLocale() const {
   return locale_;
 }