diff --git a/internal/literals/swap.go b/internal/literals/swap.go
index 2d912c9..40355f0 100644
--- a/internal/literals/swap.go
+++ b/internal/literals/swap.go
@@ -18,8 +18,10 @@ func getIndexType(dataLen int) string {
 		return "byte"
 	case dataLen <= math.MaxUint16:
 		return "uint16"
-	default:
+	case dataLen <= math.MaxUint32:
 		return "uint32"
+	default:
+		return "uint64"
 	}
 }