diff --git a/api/v1/swagger/parameters/patron.json b/api/v1/swagger/parameters/patron.json
index 2b204c17ca7..409d0b2c35b 100644
--- a/api/v1/swagger/parameters/patron.json
+++ b/api/v1/swagger/parameters/patron.json
@@ -10,7 +10,6 @@
     "name": "borrowernumber",
     "in": "query",
     "description": "Internal borrower identifier",
-    "required": true,
     "type": "integer"
   }
 }