diff --git a/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUser.cs b/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUser.cs
index 7b48e45a67..914a8c7c06 100644
--- a/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUser.cs
+++ b/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUser.cs
@@ -383,7 +383,7 @@ public class IdentityUser : FullAuditedAggregateRoot<Guid>, IUser, IHasEntityVer
         ShouldChangePasswordOnNextLogin = shouldChangePasswordOnNextLogin;
     }
 
-    public virtual void SetLastPasswordChangeTime(DateTime lastPasswordChangeTime)
+    public virtual void SetLastPasswordChangeTime(DateTime? lastPasswordChangeTime)
     {
         LastPasswordChangeTime = lastPasswordChangeTime;
     }