diff --git a/.sync.yml b/.sync.yml
index 76e371572f..e5558234e6 100644
--- a/.sync.yml
+++ b/.sync.yml
@@ -50,3 +50,6 @@ spec/spec_helper.rb:
   unmanaged: false
 .github/workflows/pr_test.yml:
   unmanaged: false
+Rakefile:
+  extras:
+    "FastGettext.default_text_domain = 'default-text-domain'"
diff --git a/Rakefile b/Rakefile
index 0a5093b33a..e66cbd3730 100644
--- a/Rakefile
+++ b/Rakefile
@@ -85,3 +85,4 @@ EOM
   end
 end
 
+FastGettext.default_text_domain = 'default-text-domain'