diff --git a/src/sparql/sparql.ts b/src/sparql/sparql.ts
index a7d9f4e36682e5b675b801b126fefdb4d5a26863..e0c38ea23ea14a5843aee214e8dae85226f41b10 100644
--- a/src/sparql/sparql.ts
+++ b/src/sparql/sparql.ts
@@ -108,7 +108,7 @@ export async function executeSparqlInsert(
       },
       body: insertQuery,
       auth: options?.auth ?? {
-        username: import.meta.env.VITE_VISITOR_USER,
+        email: import.meta.env.VITE_VISITOR_USER,
         password: import.meta.env.VITE_VISITOR_PWD,
       }
     }