diff --git a/src/AspNet.Security.OAuth.Shopify/ShopifyAuthenticationHandler.cs b/src/AspNet.Security.OAuth.Shopify/ShopifyAuthenticationHandler.cs
index 0f6d8d989..95ff06fc1 100644
--- a/src/AspNet.Security.OAuth.Shopify/ShopifyAuthenticationHandler.cs
+++ b/src/AspNet.Security.OAuth.Shopify/ShopifyAuthenticationHandler.cs
@@ -183,7 +183,7 @@ protected override async Task<OAuthTokenResponse> ExchangeCodeAsync(
                 return OAuthTokenResponse.Failed(ex);
             }
 
-            string uri = string.Format(Options.TokenEndpoint, CultureInfo.InvariantCulture, shopDns);
+            string uri = string.Format(CultureInfo.InvariantCulture, Options.TokenEndpoint, shopDns);
             HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, uri);
             request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/x-www-form-urlencoded"));