diff --git a/guix-data-service/web/repository/controller.scm b/guix-data-service/web/repository/controller.scm
index 9837867..67b37a6 100644
--- a/guix-data-service/web/repository/controller.scm
+++ b/guix-data-service/web/repository/controller.scm
@@ -208,7 +208,8 @@
            (let ((parsed-query-parameters
                   (parse-query-parameters
                    request
-                   `((package_query  ,identity)
+                   `((locale         ,identity #:default "en_US.utf8")
+                     (package_query  ,identity)
                      (linter         ,identity #:multi-value)
                      (message_query  ,identity)
                      (field          ,identity #:multi-value