diff --git a/src/tree_sitter/parser.h b/src/tree_sitter/parser.h
index cbbc7b4..2b14ac1 100644
--- a/src/tree_sitter/parser.h
+++ b/src/tree_sitter/parser.h
@@ -123,6 +123,7 @@ struct TSLanguage {
     unsigned (*serialize)(void *, char *);
     void (*deserialize)(void *, const char *, unsigned);
   } external_scanner;
+  const TSStateId *primary_state_ids;
 };
 
 /*