diff --git a/webadmin/src/js/client.js b/webadmin/src/js/client.js
index 71589ac3f..9c0b6b249 100644
--- a/webadmin/src/js/client.js
+++ b/webadmin/src/js/client.js
@@ -975,7 +975,7 @@ angular.module('Application').service('Client', ['$http', 'md5', 'Notification',
 
     Client.prototype.enoughResourcesAvailable = function (app) {
         var needed = app.manifest.memoryLimit || DEFAULT_MEMORY_LIMIT; // RAM+Swap
-        var used = this.getInstalledApps().reduce(function (prev, cur) { return prev + (cur.manifest.memoryLimit || DEFAULT_MEMORY_LIMIT); }, 0);
+        var used = this.getInstalledApps().reduce(function (prev, cur) { return prev + (cur.memoryLimit || cur.manifest.memoryLimit || DEFAULT_MEMORY_LIMIT); }, 0);
         var roundedMemory = Math.round(this.getConfig().memory / (1024 * 1024 * 1024)) * 1024 * 1024 * 1024; // round to nearest GB
         var totalMemory = roundedMemory * 1.2; // box-setup.sh creates equal amount of swap. 1.2 factor is arbitrary
         var available = (totalMemory || 0) - used;