diff --git a/lib/rest-service-client.ts b/lib/rest-service-client.ts
index ae5b320..48a8246 100644
--- a/lib/rest-service-client.ts
+++ b/lib/rest-service-client.ts
@@ -63,7 +63,7 @@ export class RestServiceClient<
 		const url = new URL(`.${pathname}`, this.#base);
 		url.search = query
 			? new URLSearchParams(
-				Object.entries(query).map(([k, v]) => [k, v?.toString() || '']),
+				Object.entries(query).map(([k, v]): [string, string] => [k, v?.toString() ?? '']),
 			).toString()
 			: '';