diff --git a/r4b/explanationofbenefit-example.json b/r4b/explanationofbenefit-example.json
index cd1ef424..c18acced 100644
--- a/r4b/explanationofbenefit-example.json
+++ b/r4b/explanationofbenefit-example.json
@@ -13,7 +13,7 @@
     {
       "focal": true,
       "coverage": { "display": "coverage" },
-      "preAuthRef": "ref#1"
+      "preAuthRef": ["ref#1"]
     }
   ],
   "supportingInfo": [