diff --git a/app/config/schema/schema.json b/app/config/schema/schema.json
index 76c8f8f0c..ba50b9212 100644
--- a/app/config/schema/schema.json
+++ b/app/config/schema/schema.json
@@ -650,7 +650,7 @@
       "columns": {
         "id": {},
         "external_identity_source_id": { "type": "integer", "foreignkey": { "table": "external_identity_sources", "column": "id" }, "notnull": true },
-        "source_key": { "type": "string", "size": 1024 },
+        "source_key": { "type": "string", "size": 1022 },
         "source_record": { "type": "text" },
         "last_update": { "type": "datetime" },
         "external_identity_id": {},