diff --git a/src-tsp/main.tsp b/src-tsp/main.tsp
index 3f1a225..9017973 100644
--- a/src-tsp/main.tsp
+++ b/src-tsp/main.tsp
@@ -113,7 +113,6 @@ union ModuleEntry {
 
 @jsonSchema("module-v1.json")
 @oneOf
-@extension("additionalProperties", false)
 union Module {
   RepoModule,
   CustomModule,