diff --git a/frontend_tests/node_tests/unread.js b/frontend_tests/node_tests/unread.js
index 4acf878f2f..a8080f360a 100644
--- a/frontend_tests/node_tests/unread.js
+++ b/frontend_tests/node_tests/unread.js
@@ -404,6 +404,16 @@ stream_data.get_stream_id = function () {
 }());
 
 (function test_declare_bankruptcy() {
+    var message = {
+        id: 16,
+        type: 'whatever',
+        stream_id: 1999,
+        subject: 'whatever',
+        mentioned: true,
+    };
+
+    unread.process_loaded_messages([message]);
+
     unread.declare_bankruptcy();
 
     var counts = unread.get_counts();
diff --git a/static/js/unread.js b/static/js/unread.js
index 6b0b1f7334..ab3a6ef13a 100644
--- a/static/js/unread.js
+++ b/static/js/unread.js
@@ -218,6 +218,7 @@ exports.process_read_message = function (message) {
 exports.declare_bankruptcy = function () {
     unread_privates = new Dict();
     exports.unread_topic_counter.clear();
+    unread_mentioned = new Dict();
 };
 
 exports.num_unread_current_messages = function () {