diff --git a/skills/mcp-builder/scripts/evaluation.py b/skills/mcp-builder/scripts/evaluation.py
index 41778569c4..f879feb1ac 100644
--- a/skills/mcp-builder/scripts/evaluation.py
+++ b/skills/mcp-builder/scripts/evaluation.py
@@ -363,7 +363,7 @@ async def main():
         report = await run_evaluation(args.eval_file, connection, args.model)
 
         if args.output:
-            args.output.write_text(report)
+            args.output.write_text(report, encoding="utf-8")
             print(f"\n✅ Report saved to {args.output}")
         else:
             print("\n" + report)