diff --git a/apps/iris/src/handler/judge-handler.go b/apps/iris/src/handler/judge-handler.go
index 83c5305676..100774f58f 100644
--- a/apps/iris/src/handler/judge-handler.go
+++ b/apps/iris/src/handler/judge-handler.go
@@ -351,6 +351,11 @@ func (j *JudgeHandler) judgeTestcase(idx int, dir string, validReq *Request,
 	res.SetJudgeExecResult(runResult.ExecResult)
 	res.Output = string(runResult.Output)
 
+	// Output이 1000자를 넘어가는 경우 1000자까지만 사용
+	if len(res.Output) > 1000 {
+		res.Output = res.Output[:1000]
+	}
+
 	if runResult.ExecResult.ResultCode != sandbox.RUN_SUCCESS {
 		res.SetJudgeResultCode(SandboxResultCodeToJudgeResultCode(runResult.ExecResult.ResultCode))
 		goto Send