diff --git a/VirtoCommerce.Storefront/Domain/Security/CustomCookieAuthenticationHandler.cs b/VirtoCommerce.Storefront/Domain/Security/CustomCookieAuthenticationHandler.cs
index 4046b297f..7b35747a7 100644
--- a/VirtoCommerce.Storefront/Domain/Security/CustomCookieAuthenticationHandler.cs
+++ b/VirtoCommerce.Storefront/Domain/Security/CustomCookieAuthenticationHandler.cs
@@ -65,7 +65,7 @@ private string GetTlsTokenBinding()
         private async Task RedirectToLoginAsync(AuthenticationProperties properties)
         {
             var redirectUri = properties.RedirectUri;
-            if (redirectUri.IsNullOrEmpty())
+            if (string.IsNullOrEmpty(redirectUri))
             {
                 redirectUri = OriginalPathBase + Request.Path + Request.QueryString;
             }