diff --git a/spec/i18n_spec.rb b/spec/i18n_spec.rb
index 991dc4143b4..22b618c8959 100644
--- a/spec/i18n_spec.rb
+++ b/spec/i18n_spec.rb
@@ -292,7 +292,11 @@ def allowed_untranslated_key?(locale, key)
       I18n::Tasks::BaseTask::ALLOWED_UNTRANSLATED_KEYS.reject { |key| key[:used] }
     expect(unused_allowed_untranslated_keys).to(
       be_empty,
-      "unused allowed untranslated i18n keys: #{unused_allowed_untranslated_keys}",
+      <<~EOS,
+        ALLOWED_UNTRANSLATED_KEYS contains unused allowed untranslated i18n keys.
+        The following keys can be removed from ALLOWED_UNTRANSLATED_KEYS:
+        #{unused_allowed_untranslated_keys.pretty_inspect}
+      EOS
     )
   end