diff --git a/browser/components/preferences/dialogs/syncChooseWhatToSync.js b/browser/components/preferences/dialogs/syncChooseWhatToSync.js
index 64aa0d98a0622c01f3dcfff1a04bfcda368354d2..2013e04b0881ad2295d6897b91e1573cc6efc571 100644
--- a/browser/components/preferences/dialogs/syncChooseWhatToSync.js
+++ b/browser/components/preferences/dialogs/syncChooseWhatToSync.js
@@ -21,6 +21,7 @@ Preferences.addAll([
   { id: "services.sync.engine.passwords", type: "bool" },
   { id: "services.sync.engine.addresses", type: "bool" },
   { id: "services.sync.engine.creditcards", type: "bool" },
+  { id: "services.sync.engine.spaces", type: "bool" },
 ]);
 
 let gSyncChooseWhatToSync = {
