diff --git a/public/openapi/components/schemas/PostsObject.yaml b/public/openapi/components/schemas/PostsObject.yaml
index 2c6595c1ca..ed546b052a 100644
--- a/public/openapi/components/schemas/PostsObject.yaml
+++ b/public/openapi/components/schemas/PostsObject.yaml
@@ -112,4 +112,6 @@ PostsObject:
             nullable: true
             type: string
       isMainPost:
-        type: boolean
\ No newline at end of file
+        type: boolean
+      replies:
+        type: number
\ No newline at end of file
diff --git a/src/posts/data.js b/src/posts/data.js
index bc4ba790d1..4d7edac799 100644
--- a/src/posts/data.js
+++ b/src/posts/data.js
@@ -53,6 +53,11 @@ module.exports = function (Posts) {
 		data.pid = pid;
 		plugins.fireHook('action:post.setFields', { data: data });
 	};
+
+	Posts.getReplyCount = async function (pid) {
+		// const keys = pids.map(pid => 'pid:' +pid + ':replies');
+		return await db.sortedSetCard(`pid:${pid}:replies`);
+	};
 };
 
 function modifyPost(post, fields) {
diff --git a/src/posts/summary.js b/src/posts/summary.js
index ad3258076a..60d2305cea 100644
--- a/src/posts/summary.js
+++ b/src/posts/summary.js
@@ -38,7 +38,7 @@ module.exports = function (Posts) {
 		const tidToTopic = toObject('tid', topicsAndCategories.topics);
 		const cidToCategory = toObject('cid', topicsAndCategories.categories);
 
-		posts.forEach(function (post) {
+		Promise.all(posts.map(async (post) => {
 			// If the post author isn't represented in the retrieved users' data, then it means they were deleted, assume guest.
 			if (!uidToUser.hasOwnProperty(post.uid)) {
 				post.uid = 0;
@@ -47,9 +47,12 @@ module.exports = function (Posts) {
 			post.topic = tidToTopic[post.tid];
 			post.category = post.topic && cidToCategory[post.topic.cid];
 			post.isMainPost = post.topic && post.pid === post.topic.mainPid;
+			post.replies = await Posts.getReplyCount(post.pid);
 			post.deleted = post.deleted === 1;
 			post.timestampISO = utils.toISOString(post.timestamp);
-		});
+
+			return post;
+		}));
 
 		posts = posts.filter(post => tidToTopic[post.tid]);