diff --git a/include/tree_sitter/parser.h b/include/tree_sitter/parser.h
index a96ac7e3..513ebe2f 100644
--- a/include/tree_sitter/parser.h
+++ b/include/tree_sitter/parser.h
@@ -182,7 +182,6 @@ typedef struct {
         struct {
             ts_symbol symbol;
             int child_count;
-            const int *collapse_flags;
         };
     } data;
 } ts_parse_action;