diff --git a/guix-data-service/model/lint-warning-message.scm b/guix-data-service/model/lint-warning-message.scm
index 50c9f77..20a5d68 100644
--- a/guix-data-service/model/lint-warning-message.scm
+++ b/guix-data-service/model/lint-warning-message.scm
@@ -64,7 +64,8 @@
            (string-append
             "SELECT id FROM lint_warning_message_sets "
             "WHERE message_ids = ARRAY["
-            (string-join (map number->string lint-warning-message-ids) ", ")
+            (string-join (map number->string
+                              (sort lint-warning-message-ids <)) ", ")
             "]"))))
 
     (string->number