diff --git a/IRaCIS.Core.Application/Service/TrialSiteUser/TrialExternalUserService.cs b/IRaCIS.Core.Application/Service/TrialSiteUser/TrialExternalUserService.cs
index 754f6edb1..26ea0bd3e 100644
--- a/IRaCIS.Core.Application/Service/TrialSiteUser/TrialExternalUserService.cs
+++ b/IRaCIS.Core.Application/Service/TrialSiteUser/TrialExternalUserService.cs
@@ -291,7 +291,7 @@ namespace IRaCIS.Core.Application.Service
         /// </summary>
         /// <param name="editTrialUserPreparation"></param>
         /// <returns></returns>
-        [AllowAnonymou
+        [AllowAnonymous]
         public async Task<IResponseOutput> TrialExternalUserJoinTrial(TrialExternalUserConfirm editTrialUserPreparation)
         {