diff --git a/src/controllers/tags.js b/src/controllers/tags.js
index 392ff9201e..52ef647625 100644
--- a/src/controllers/tags.js
+++ b/src/controllers/tags.js
@@ -25,7 +25,7 @@ tagsController.getTag = async function (req, res) {
 		breadcrumbs: helpers.buildBreadcrumbs([{ text: '[[tags:tags]]', url: '/tags' }, { text: tag }]),
 		title: `[[pages:tag, ${tag}]]`,
 	};
-	const [settings, cids, categoryData, canPost, isPrivileged, rssToken, isFollowing] = await Promise.all([
+	let [settings, cids, categoryData, canPost, isPrivileged, rssToken, isFollowing] = await Promise.all([
 		user.getSettings(req.uid),
 		cid || categories.getCidsByPrivilege('categories:cid', req.uid, 'topics:read'),
 		helpers.getSelectedCategory(cid),
@@ -34,6 +34,14 @@ tagsController.getTag = async function (req, res) {
 		user.auth.getFeedToken(req.uid),
 		topics.isFollowingTag(req.params.tag, req.uid),
 	]);
+
+	// Explicitly exclude cid -1 if cid not specified
+	if (!cid) {
+		cids = new Set(cids);
+		cids.delete(-1);
+		cids = Array.from(cids);
+	}
+
 	const start = Math.max(0, (page - 1) * settings.topicsPerPage);
 	const stop = start + settings.topicsPerPage - 1;