diff --git a/Sources/Engine/JWT/JWT.swift b/Sources/Engine/JWT/JWT.swift
index 24a94aa..24a5b79 100644
--- a/Sources/Engine/JWT/JWT.swift
+++ b/Sources/Engine/JWT/JWT.swift
@@ -160,5 +160,9 @@ public struct JWT {
         case keyContainsNoData(String)
         case googleServiceAccountJsonNotFound(path: String)
         case invalidResonse(response: URLResponse)
+        /// The URL string is malformed or cannot be converted to a valid `URL`.
+        /// - Parameter url: The malformed URL string.
+        case malformedUrl(String)
     }
 }
+