diff --git a/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUserManager.cs b/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUserManager.cs
index fc71966c09..5ce3663e14 100644
--- a/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUserManager.cs
+++ b/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUserManager.cs
@@ -321,7 +321,7 @@ public class IdentityUserManager : UserManager<IdentityUser>, IDomainService
 
         result.CheckErrors();
 
-        if (!string.IsNullOrEmpty(oldUserName) && !oldUserName.Equals(userName, StringComparison.OrdinalIgnoreCase))
+        if (!string.IsNullOrEmpty(oldUserName) && oldUserName != userName)
         {
             await DistributedEventBus.PublishAsync(
                 new IdentityUserUserNameChangedEto