diff --git a/src/js/assets.js b/src/js/assets.js
index 07255364f..d0db48449 100644
--- a/src/js/assets.js
+++ b/src/js/assets.js
@@ -1011,7 +1011,9 @@ var updateDone = function() {
 
 api.updateStart = function(details) {
     var oldUpdateDelay = updaterAssetDelay,
-        newUpdateDelay = details.delay || updaterAssetDelayDefault;
+        newUpdateDelay = typeof details.delay === 'number' ?
+            details.delay :
+            updaterAssetDelayDefault;
     updaterAssetDelay = Math.min(oldUpdateDelay, newUpdateDelay);
     if ( updaterStatus !== undefined ) {
         if ( newUpdateDelay < oldUpdateDelay ) {
diff --git a/src/js/messaging.js b/src/js/messaging.js
index 51c91606c..eefb95788 100644
--- a/src/js/messaging.js
+++ b/src/js/messaging.js
@@ -121,7 +121,9 @@ var onMessage = function(request, sender, callback) {
 
     case 'forceUpdateAssets':
         µb.scheduleAssetUpdater(0);
-        µb.assets.updateStart({ delay: µb.hiddenSettings.manualUpdateAssetFetchPeriod || 2000 });
+        µb.assets.updateStart({
+            delay: µb.hiddenSettings.manualUpdateAssetFetchPeriod
+        });
         break;
 
     case 'getAppData':