diff --git a/testbed/scripts/schedule-poweroff.sh b/testbed/scripts/schedule-poweroff.sh
index 7af16cf..ada5464 100755
--- a/testbed/scripts/schedule-poweroff.sh
+++ b/testbed/scripts/schedule-poweroff.sh
@@ -1,7 +1,13 @@
 #!/bin/bash
 set -ex
 
+SKIP_FILE=/tmp/skip-poweroff
 /bin/date
-/sbin/shutdown -h 60
-wall "The system shutdown is scheduled in 1 hour. Use 'shutdown -c' to cancel."
-echo ''
+if [[ -f "$SKIP_FILE" ]]; then
+    echo "poweroff skipped for this time."
+    rm -rf "$SKIP_FILE"
+else
+    /sbin/shutdown -h 60
+    wall "The system shutdown is scheduled in 1 hour. Use 'shutdown -c' to cancel."
+fi
+echo