diff --git a/opt/bin/sandbox b/opt/bin/sandbox
index 6513a0d..9568dd7 100755
--- a/opt/bin/sandbox
+++ b/opt/bin/sandbox
@@ -1,2 +1,2 @@
-#!/bin/sh
-exec docker run --rm -it --network none sandbox
\ No newline at end of file
+#!/bin/sh -eu
+exec docker run --rm -it --network none sandbox