diff --git a/tine20/Tinebase/js/ux/Percentage.js b/tine20/Tinebase/js/ux/Percentage.js
index 6894bb2d3db..e0b2dd4eca1 100644
--- a/tine20/Tinebase/js/ux/Percentage.js
+++ b/tine20/Tinebase/js/ux/Percentage.js
@@ -238,7 +238,7 @@ Ext.ux.PercentRendererWithName = function(value, metadata, record) {
         fileName = '<div class="mime-icon-overlay mime-icon-link"></div>' + fileName;
     }
     
-    if(record.get('is_quarantined')) {
+    if(record.get('is_quarantined') === '1') {
         const warningText = i18n._('This file might potentially harm your computer. Therefore it got quarantined and cannot be edited or downloaded.');
         fileName = '<div class="mime-icon-overlay x-tinebase-virus" ext:qtip="'+ Tine.Tinebase.common.doubleEncode(warningText) +'"></div>' + fileName + ' (' + i18n._('quarantined') + ')';
     }