diff --git a/app/assets/javascripts/discourse/app/components/software-update-prompt.js b/app/assets/javascripts/discourse/app/components/software-update-prompt.js
index 39831fce180..0de3b1e7f2d 100644
--- a/app/assets/javascripts/discourse/app/components/software-update-prompt.js
+++ b/app/assets/javascripts/discourse/app/components/software-update-prompt.js
@@ -43,7 +43,7 @@ export default Component.extend({
       }
 
       if (!this._timeoutHandler && this.session.requiresRefresh) {
-        if (isTesting) {
+        if (isTesting()) {
           this.set("showPrompt", true);
         } else {
           // Since we can do this transparently for people browsing the forum