diff --git a/packages/hydrojudge/src/sandbox.ts b/packages/hydrojudge/src/sandbox.ts
index 386fb1a15..dae24667f 100644
--- a/packages/hydrojudge/src/sandbox.ts
+++ b/packages/hydrojudge/src/sandbox.ts
@@ -98,6 +98,7 @@ function proc(params: Parameter): Cmd {
         strictMemoryLimit: getConfig('strict_memory'),
         // stackLimit: memory * 1024 * 1024,
         procLimit: params.processLimit || getConfig('processLimit'),
+        copyOutMax: Math.floor(1024 * 1024 * size * 3),
         copyIn,
         copyOut,
         copyOutCached,