diff --git a/src/Identity/UI/src/Areas/Identity/Pages/V4/Account/Login.cshtml.cs b/src/Identity/UI/src/Areas/Identity/Pages/V4/Account/Login.cshtml.cs
index 8b21750186..c052f1ec01 100644
--- a/src/Identity/UI/src/Areas/Identity/Pages/V4/Account/Login.cshtml.cs
+++ b/src/Identity/UI/src/Areas/Identity/Pages/V4/Account/Login.cshtml.cs
@@ -109,7 +109,7 @@ namespace Microsoft.AspNetCore.Identity.UI.V4.Pages.Account.Internal
                 ModelState.AddModelError(string.Empty, ErrorMessage);
             }
 
-            returnUrl = returnUrl ?? Url.Content("~/");
+            returnUrl ??= Url.Content("~/");
 
             // Clear the existing external cookie to ensure a clean login process
             await HttpContext.SignOutAsync(IdentityConstants.ExternalScheme);
@@ -121,7 +121,7 @@ namespace Microsoft.AspNetCore.Identity.UI.V4.Pages.Account.Internal
 
         public override async Task<IActionResult> OnPostAsync(string returnUrl = null)
         {
-            returnUrl = returnUrl ?? Url.Content("~/");
+            returnUrl ??= Url.Content("~/");
 
             ExternalLogins = (await _signInManager.GetExternalAuthenticationSchemesAsync()).ToList();
 
diff --git a/src/Identity/UI/src/Areas/Identity/Pages/V4/Account/Register.cshtml.cs b/src/Identity/UI/src/Areas/Identity/Pages/V4/Account/Register.cshtml.cs
index 8e2a7e2faf..1276e61969 100644
--- a/src/Identity/UI/src/Areas/Identity/Pages/V4/Account/Register.cshtml.cs
+++ b/src/Identity/UI/src/Areas/Identity/Pages/V4/Account/Register.cshtml.cs
@@ -126,7 +126,7 @@ namespace Microsoft.AspNetCore.Identity.UI.V4.Pages.Account.Internal
 
         public override async Task<IActionResult> OnPostAsync(string returnUrl = null)
         {
-            returnUrl = returnUrl ?? Url.Content("~/");
+            returnUrl ??= Url.Content("~/");
             ExternalLogins = (await _signInManager.GetExternalAuthenticationSchemesAsync()).ToList();
             if (ModelState.IsValid)
             {