diff --git a/src/parser/parser_types.nim b/src/parser/parser_types.nim
index eaa55f7..7b63e67 100644
--- a/src/parser/parser_types.nim
+++ b/src/parser/parser_types.nim
@@ -209,11 +209,11 @@ proc applyParsersSeqToSingle*[T](
 ): BuilderResult[T] =
     xs.foldl(
       a.flatMap((builder: Builder[T]) => applyParsersToSingle(
-        builder,
-        b.parsers,
-        b.tokenFoldFn,
-        b.ignoreEmpty,
-        initT,
+        builder = builder,
+        parsers = b.parsers,
+        tokenFoldFn = b.tokenFoldFn,
+        optional = b.ignoreEmpty,
+        initT = initT,
         isFirst = a == builderResult
       )),
       builderResult