diff --git a/src/parser/builder_api.nim b/src/parser/builder_api.nim
index f4523fb..c95888f 100644
--- a/src/parser/builder_api.nim
+++ b/src/parser/builder_api.nim
@@ -51,7 +51,7 @@ proc tryParseBuild*[T](
         builderAcc = builder.initBuilder(
           okParser,
           concat(
-            builderAcc[1],
+            builderAcc.tree,
             defaultBuilderTokens,
             builderFn(okParser.tokens),
           )
@@ -68,9 +68,9 @@ proc tryParseBuild*[T](
   )
 
   BuilderResult[T].ok(builder.initBuilder(
-    builderAcc[0],
+    builderAcc.parser,
     concat(
-      builderAcc[1],
+      builderAcc.tree,
       defaultBuilderTokens,
     ),
   ))