diff --git a/lib/error/feature-has-tag-error.js b/lib/error/feature-has-tag-error.js
index 8180773be2..05b35d623d 100644
--- a/lib/error/feature-has-tag-error.js
+++ b/lib/error/feature-has-tag-error.js
@@ -11,7 +11,7 @@ class FeatureHasTagError extends Error {
 
     toJSON() {
         const obj = {
-            isJoi: false,
+            isJoi: true,
             name: this.constructor.name,
             details: [
                 {