diff --git a/src/cards/ha-persistent_notification-card.html b/src/cards/ha-persistent_notification-card.html
index 7f603df40d..adbf5c4aab 100644
--- a/src/cards/ha-persistent_notification-card.html
+++ b/src/cards/ha-persistent_notification-card.html
@@ -72,7 +72,7 @@ Polymer({
     var message = '';
     if (scriptLoaded) {
       el = this.$.pnContent;
-      message = micromarkdown.parse(stateObj.state);
+      message = window.micromarkdown.parse(stateObj.state);
       el.innerHTML = message;
     }
     return;