diff --git a/src/browser/base/content/zen-preloaded.inc.xhtml b/src/browser/base/content/zen-preloaded.inc.xhtml
index 76f32fd5f..ab5354092 100644
--- a/src/browser/base/content/zen-preloaded.inc.xhtml
+++ b/src/browser/base/content/zen-preloaded.inc.xhtml
@@ -6,6 +6,7 @@
 # the window is fully loaded.
 # Make sure they are loaded before the global-scripts.inc file.
 <script type="text/javascript" src="chrome://browser/content/zen-sets.js"></script>
+<script type="text/javascript" src="chrome://browser/content/zen-components/ZenWorkspacesSync.mjs"></script>
 
 <script type="module" src="chrome://browser/content/zen-components/ZenHasPolyfill.mjs"></script>
 <script type="module" src="chrome://browser/content/zen-components/ZenWorkspaces.mjs"></script>