diff --git a/src/Microsoft.AspNetCore.WebUtilities/ReasonPhrases.cs b/src/Microsoft.AspNetCore.WebUtilities/ReasonPhrases.cs
index f84f762475..3aab17079d 100644
--- a/src/Microsoft.AspNetCore.WebUtilities/ReasonPhrases.cs
+++ b/src/Microsoft.AspNetCore.WebUtilities/ReasonPhrases.cs
@@ -73,7 +73,7 @@ namespace Microsoft.AspNetCore.WebUtilities
             { 505, "HTTP Version Not Supported" },
             { 506, "Variant Also Negotiates" },
             { 507, "Insufficient Storage" },
-            { 507, "Loop Detected" },
+            { 508, "Loop Detected" },
             { 510, "Not Extended" },
             { 511, "Network Authentication Required" },
         };