diff --git a/addons/mail/static/src/js/systray/systray_activity_menu.js b/addons/mail/static/src/js/systray/systray_activity_menu.js
index fae95a78c2f..641ff4be1bc 100644
--- a/addons/mail/static/src/js/systray/systray_activity_menu.js
+++ b/addons/mail/static/src/js/systray/systray_activity_menu.js
@@ -108,6 +108,7 @@ var ActivityMenu = Widget.extend({
      */
     _onActivityActionClick: function (ev) {
         ev.stopPropagation();
+        this.$('.dropdown-toggle').dropdown('toggle');
         var targetAction = $(ev.currentTarget);
         var actionXmlid = targetAction.data('action_xmlid');
         if (actionXmlid) {
diff --git a/addons/mail/static/tests/systray/systray_activity_menu_tests.js b/addons/mail/static/tests/systray/systray_activity_menu_tests.js
index b2f76feb832..7d24b5e05a4 100644
--- a/addons/mail/static/tests/systray/systray_activity_menu_tests.js
+++ b/addons/mail/static/tests/systray/systray_activity_menu_tests.js
@@ -153,7 +153,7 @@ QUnit.test('activity menu widget: activity menu with 3 records', async function
 });
 
 QUnit.test('activity menu widget: activity view icon', async function (assert) {
-    assert.expect(10);
+    assert.expect(12);
     var self = this;
     var activityMenu = new ActivityMenu();
     testUtils.mock.addMockEnvironment(activityMenu, {
@@ -193,9 +193,15 @@ QUnit.test('activity menu widget: activity view icon', async function (assert) {
 
     // click on the "Issue" activity icon
     await testUtils.dom.click(activityMenu.$('.dropdown-toggle'));
+    assert.hasClass(activityMenu.$('.dropdown-menu'), 'show',
+        "dropdown should be expanded");
+
     await testUtils.dom.click(activityMenu.$(".o_mail_activity_action[data-model_name='Issue']"));
+    assert.doesNotHaveClass(activityMenu.$('.dropdown-menu'), 'show',
+        "dropdown should be collapsed");
 
     // click on the "Note" activity icon
+    await testUtils.dom.click(activityMenu.$('.dropdown-toggle'));
     await testUtils.dom.click(activityMenu.$(".o_mail_activity_action[data-model_name='Note']"));
 
     assert.verifySteps([