diff --git a/packages/lib/src/subscriptions.ts b/packages/lib/src/subscriptions.ts
index b2dbdb4c..9ecd493d 100644
--- a/packages/lib/src/subscriptions.ts
+++ b/packages/lib/src/subscriptions.ts
@@ -208,7 +208,7 @@ export class SubscriptionController {
 export class EventSubscriber<T extends Event<T>, V=T> {
 	_callbacks = new Array<EventSubscriberCallback<V>>();
 	lastResponse: Event<T> | null = null;
-	lastResponseTime = 0;
+	lastResponseTime = -1;
 	control?: Link;
 
 	constructor(
diff --git a/test/lib/subscriptions.js b/test/lib/subscriptions.js
index b4c77470..3405fcfa 100644
--- a/test/lib/subscriptions.js
+++ b/test/lib/subscriptions.js
@@ -63,8 +63,8 @@ describe("lib/subscriptions", function() {
 			assert.deepEqual(reconstructed, response);
 		});
 
-		it("should be round trip json serialisable with a null event replay", function() {
-			const response = new lib.SubscriptionResponse(null);
+		it("should be round trip json serialisable with an undefined event replay", function() {
+			const response = new lib.SubscriptionResponse(undefined);
 			const json = JSON.stringify(response);
 			assert.equal(typeof json, "string");
 			const reconstructed = lib.SubscriptionResponse.fromJSON(JSON.parse(json));
@@ -396,13 +396,13 @@ describe("lib/subscriptions", function() {
 
 		describe("_updateSubscription()", function() {
 			it("should correctly request a subscription", async function() {
-				const expected = new lib.SubscriptionRequest(RegisteredEvent.name, true);
+				const expected = new lib.SubscriptionRequest(RegisteredEvent.name, true, -1);
 				registeredEvent.subscribe(() => true);
 				await events.once(mockControl.connector, "send");
 				assertLastRequest(expected);
 			});
-			it("should correctly request a no subscriptions", async function() {
-				const expected = new lib.SubscriptionRequest(RegisteredEvent.name, false);
+			it("should correctly request no subscriptions", async function() {
+				const expected = new lib.SubscriptionRequest(RegisteredEvent.name, false, -1);
 				function callback() {}
 				registeredEvent.subscribe(callback);
 				await events.once(mockControl.connector, "send");