diff --git a/DevProxy.Plugins/Generation/OpenApiSpecGeneratorPlugin.cs b/DevProxy.Plugins/Generation/OpenApiSpecGeneratorPlugin.cs
index 255b2a5d..af807c28 100644
--- a/DevProxy.Plugins/Generation/OpenApiSpecGeneratorPlugin.cs
+++ b/DevProxy.Plugins/Generation/OpenApiSpecGeneratorPlugin.cs
@@ -742,7 +742,7 @@ private static string GetFileNameFromServerUrl(string serverUrl, SpecFormat form
             SpecFormat.Yaml => "yaml",
             _ => "json"
         };
-        var fileName = $"{uri.Host}-{DateTime.Now:yyyyMMddHHmmss}.{ext}";
+        var fileName = $"{uri.Host}-{uri.Port}-{DateTime.Now:yyyyMMddHHmmss}.{ext}";
         return fileName;
     }