diff --git a/src/NzbDrone.Common/Http/HttpUri.cs b/src/NzbDrone.Common/Http/HttpUri.cs
index 647da04ee..9cc3b8fec 100644
--- a/src/NzbDrone.Common/Http/HttpUri.cs
+++ b/src/NzbDrone.Common/Http/HttpUri.cs
@@ -170,7 +170,7 @@ namespace NzbDrone.Common.Http
 
             if (baseSlashIndex >= 0)
             {
-                return basePath.Substring(0, baseSlashIndex) + "/" + relativePath;
+                return $"{basePath.AsSpan(0, baseSlashIndex)}/{relativePath}";
             }
 
             return relativePath;