diff --git a/sig/lrama/grammar/parser_state.rbs b/sig/lrama/grammar/parser_state.rbs
index 35dbb69b..05e16f85 100644
--- a/sig/lrama/grammar/parser_state.rbs
+++ b/sig/lrama/grammar/parser_state.rbs
@@ -19,6 +19,9 @@ module Lrama
       def int_to_name: () -> Array[String]
       def enum_name_table_name: () -> String
       def stack_prefix: () -> String
+
+      private
+      def enum_numbers:() -> Array[String]
     end
   end
 end