diff --git a/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityLinkUserManager.cs b/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityLinkUserManager.cs
index 7e623e2094..08d6204734 100644
--- a/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityLinkUserManager.cs
+++ b/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityLinkUserManager.cs
@@ -175,7 +175,7 @@ public class IdentityLinkUserManager : DomainService
         }
     }
 
-    public virtual async Task<string> GetLinkConsentAsync(IdentityLinkUserInfo sourceLinkUser, CancellationToken cancellationToken = default)
+    public virtual async Task<string?> GetLinkConsentAsync(IdentityLinkUserInfo sourceLinkUser, CancellationToken cancellationToken = default)
     {
         using (CurrentTenant.Change(sourceLinkUser.TenantId))
         {