diff --git a/common/models/user.json b/common/models/user.json
index 98b8fd5a31..ce04d939f7 100644
--- a/common/models/user.json
+++ b/common/models/user.json
@@ -61,6 +61,9 @@
     "githubProfile": {
       "type": "string"
     },
+    "_csrf": {
+      "type": "string"
+    },
     "isMigrationGrandfathered": {
       "type": "boolean",
       "default": false