diff --git a/src/core/base.ts b/src/core/base.ts
index dc1acfb1..94377b19 100644
--- a/src/core/base.ts
+++ b/src/core/base.ts
@@ -4,8 +4,8 @@ export type PartialRecord<K extends keyof any, T> = {
 }
 
 export interface NameValue {
-    name: string;
-    value: string;
+    readonly name: string;
+    readonly value: string;
 }
 
 export interface TypeAndName {