diff --git a/weeder.toml b/weeder.toml
index 21c1c1750..177979db9 100644
--- a/weeder.toml
+++ b/weeder.toml
@@ -40,6 +40,7 @@ roots = [
     "^Swarm.Language.Syntax.Pattern.UTerm$",
     "^Swarm.Language.Syntax.Util.asTree$",
     "^Swarm.Language.Syntax.Util.mapFreeS$",
+    "^Swarm.Language.Types.expandTydefs$",
     "^Swarm.Util.isSuccessOr$",
     "^Swarm.Util.replaceLast$",
     "^Swarm.Util.reflow$",