diff --git a/src/components/timeout-dialog/timeout-dialog.js b/src/components/timeout-dialog/timeout-dialog.js
index 25fab90c..b6534232 100644
--- a/src/components/timeout-dialog/timeout-dialog.js
+++ b/src/components/timeout-dialog/timeout-dialog.js
@@ -76,7 +76,9 @@ function TimeoutDialog($module, $sessionActivityService) {
   }
 
   const broadcastSessionActivity = () => {
-    sessionActivityService.logActivity();
+    if (settings.synchroniseTabs) {
+      sessionActivityService.logActivity();
+    }
   };
 
   const listenForSessionActivityAndResetDialogTimer = () => {
diff --git a/src/components/timeout-dialog/timeout-dialog.test.js b/src/components/timeout-dialog/timeout-dialog.test.js
index 86dd896a..2579638b 100644
--- a/src/components/timeout-dialog/timeout-dialog.test.js
+++ b/src/components/timeout-dialog/timeout-dialog.test.js
@@ -126,6 +126,7 @@ describe('/components/timeout-dialog', () => {
     utils.ajaxGet.mockReset();
     redirectHelper.redirectToUrl.mockReset();
     mockSessionActivityService.onActivity.mockReset();
+    mockSessionActivityService.logActivity.mockReset();
     jest.clearAllTimers();
   });
 
@@ -868,13 +869,28 @@ describe('/components/timeout-dialog', () => {
   describe('timeout broadcast feature switch disabled', () => {
     beforeEach(() => {
       setSynchroniseTabs('false');
-      setupDialog();
+      setupDialog({}, {});
     });
     it('should show dialog, as no callback is registered on the session activity service', () => {
       expect(mockSessionActivityService.onActivity).not.toHaveBeenCalled();
+      expect(mockSessionActivityService.logActivity).not.toHaveBeenCalled();
+
+      pretendSecondsHavePassed(780);
+
+      expect(dialog.displayDialog).toHaveBeenCalled();
+    });
+
+    it('should not broadcast when clicked', () => {
+      expect(mockSessionActivityService.onActivity).not.toHaveBeenCalled();
+      expect(mockSessionActivityService.logActivity).not.toHaveBeenCalled();
 
       pretendSecondsHavePassed(780);
 
+      clickElem(testScope.latestDialog$element.querySelector('#hmrc-timeout-keep-signin-btn'));
+
+      expect(mockSessionActivityService.onActivity).not.toHaveBeenCalled();
+      expect(mockSessionActivityService.logActivity).not.toHaveBeenCalled();
+
       expect(dialog.displayDialog).toHaveBeenCalled();
     });
   });