diff --git a/pyproject.toml b/pyproject.toml
index 5a5225d..db2ed31 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ license = "AGPL-3.0-or-later"
 readme = "README.md"
 
 include = [
-    { path = "kosmorro/locales/**/*.mo", format = "wheel" },
+    { path = "kosmorro/locales/**/*.mo", format=["sdist", "wheel"] },
     { path = "kosmorro/assets", format=["sdist", "wheel"] },
 ]