diff --git a/lib/client.js b/lib/client.js
index a0ee321..cfbf23c 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -940,7 +940,7 @@ export default class Client extends EventTarget {
 		}
 		if (messages.length >= max) {
 			// There are still more messages to fetch
-			after.time = messages[messages.length - 1].tags.time;
+			after = { ...after, time: messages[messages.length - 1].tags.time };
 			return await this.fetchHistoryBetween(target, after, before, limit);
 		}
 		return { messages };