diff --git a/chrome/content/zotero/xpcom/data/feeds.js b/chrome/content/zotero/xpcom/data/feeds.js
index edc24927bc..f36b5060f5 100644
--- a/chrome/content/zotero/xpcom/data/feeds.js
+++ b/chrome/content/zotero/xpcom/data/feeds.js
@@ -258,6 +258,9 @@ Zotero.Feeds = new function () {
 	};
 
 	let globalFeedCheckDelay = Promise.resolve();
+	
+	this._nextFeedCheckDelay = null; // For tests
+	
 	this.scheduleNextFeedCheck = async function () {
 		// Don't schedule if already updating, since another check is scheduled at the end
 		if (_updating) {
@@ -280,6 +283,7 @@ Zotero.Feeds = new function () {
 
 		if (nextCheck !== false) {
 			nextCheck = nextCheck > 0 ? nextCheck * 1000 : 0;
+			this._nextFeedCheckDelay = nextCheck;
 			Zotero.debug("Next feed check in " + (nextCheck / 1000) + " seconds");
 			this._nextFeedCheck = setTimeout(async () => {
 				await globalFeedCheckDelay;
diff --git a/test/tests/feedsTest.js b/test/tests/feedsTest.js
index d2fd4412d3..6eddc93e9d 100644
--- a/test/tests/feedsTest.js
+++ b/test/tests/feedsTest.js
@@ -224,7 +224,6 @@ describe("Zotero.Feeds", function () {
 	describe('#scheduleNextFeedCheck()', function () {
 		it('schedules next feed check', async function () {
 			sinon.spy(Zotero.Feeds, 'scheduleNextFeedCheck');
-			sinon.spy(Zotero.Promise, 'delay');
 			
 			await clearFeeds();
 			let feed = await createFeed({refreshInterval: 1});
@@ -234,10 +233,9 @@ describe("Zotero.Feeds", function () {
 			await Zotero.Feeds.scheduleNextFeedCheck();
 			
 			// Allow a propagation delay of 5000ms
-			assert.isTrue(Zotero.Promise.delay.args[0][0] - 1000*60*60 <= 5000);
+			assert.isTrue(Zotero.Feeds._nextFeedCheckDelay - 1000 * 60 * 60 <= 5000);
 			
 			Zotero.Feeds.scheduleNextFeedCheck.restore();
-			Zotero.Promise.delay.restore();
 		});
 	})
 })