diff --git a/csexp/sexp.go b/csexp/sexp.go
index 9876293..69791cc 100644
--- a/csexp/sexp.go
+++ b/csexp/sexp.go
@@ -152,13 +152,9 @@ func Parse(data []byte) (Sexp, error) {
 		gigaparsec.End[byte](),
 		func(s Sexp, _ struct{}) Sexp { return s },
 	)
-	result, err := parser(gigaparsec.MakeState(cursor.NewSlice(data)))
+	result, err := gigaparsec.Run(parser, cursor.NewSlice(data))
 	if err != nil {
 		return nil, fmt.Errorf("csexp.Parse: %w", err)
 	}
-	if failed, _, msg := result.Failed(); failed {
-		return nil, fmt.Errorf("csexp.Parse: %v", msg)
-	}
-	_, _, sexp, _, _ := result.Succeeded()
-	return sexp, nil
+	return result, nil
 }