diff --git a/lib/rbi/index.rb b/lib/rbi/index.rb
index 46b48b3f..08787f29 100644
--- a/lib/rbi/index.rb
+++ b/lib/rbi/index.rb
@@ -19,7 +19,7 @@ def index(*node)
 
     sig { void }
     def initialize
-      super()
+      super
       @index = T.let({}, T::Hash[String, T::Array[Node]])
     end