diff --git a/src/core/xfa/factory.js b/src/core/xfa/factory.js
index 7f9f4f28d..5dacfbb10 100644
--- a/src/core/xfa/factory.js
+++ b/src/core/xfa/factory.js
@@ -43,7 +43,7 @@ class XFAFactory {
   }
 
   isValid() {
-    return this.root && this.form;
+    return !!(this.root && this.form);
   }
 
   /**