diff --git a/src/VirtoCommerce.Platform.Web/Startup.cs b/src/VirtoCommerce.Platform.Web/Startup.cs
index 56e69a2cbb..ceaa983f5c 100644
--- a/src/VirtoCommerce.Platform.Web/Startup.cs
+++ b/src/VirtoCommerce.Platform.Web/Startup.cs
@@ -353,7 +353,7 @@ public void ConfigureServices(IServiceCollection services)
                     options.AllowPasswordFlow()
                         .AllowRefreshTokenFlow()
                         .AllowClientCredentialsFlow()
-                        .AllowCustomFlow("impersonate");
+                        .AllowCustomFlow(PlatformConstants.Security.GrantTypes.Impersonate);
 
                     options.SetRefreshTokenLifetime(authorizationOptions?.RefreshTokenLifeTime);
                     options.SetAccessTokenLifetime(authorizationOptions?.AccessTokenLifeTime);