diff --git a/sources/client/src/api/search-entities.ts b/sources/client/src/api/search-entities.ts
index ab6a751..44e5993 100644
--- a/sources/client/src/api/search-entities.ts
+++ b/sources/client/src/api/search-entities.ts
@@ -33,7 +33,7 @@ export async function searchEntities<E>(
 	});
 
 	// TODO What happen in the case of an error?
-	const entities = await fetch<Array<E>>({
+	const entities = await fetch<ReadonlyArray<E>>({
 		path: `?rest_route=/wp/v2/search&${params.toString()}`,
 	});
 
diff --git a/sources/client/src/vo/set.ts b/sources/client/src/vo/set.ts
index 77e93bb..4788c8f 100644
--- a/sources/client/src/vo/set.ts
+++ b/sources/client/src/vo/set.ts
@@ -1,7 +1,7 @@
 export class Set<T> {
 	readonly #data: ReadonlyArray<T>;
 
-	public constructor(data: Array<T> = []) {
+	public constructor(data: ReadonlyArray<T> = []) {
 		this.#data = data;
 	}