diff --git a/jetty/Dockerfile b/jetty/Dockerfile
index 881027f91..fc3e50d05 100644
--- a/jetty/Dockerfile
+++ b/jetty/Dockerfile
@@ -14,4 +14,6 @@ RUN mkdir -p /opt/cprof && \
 USER jetty
 
 EXPOSE 8080
-ENTRYPOINT ["/bin/sh", "/start.sh"]
+# jetty:12-jdk21 has bash. We can afford the extra 200M in image size over
+# the -alpine flavor.
+ENTRYPOINT ["/bin/bash", "/start.sh"]
diff --git a/jetty/start.sh b/jetty/start.sh
index 988367e81..84b2c123f 100755
--- a/jetty/start.sh
+++ b/jetty/start.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # Copyright 2024 The Nomulus Authors. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");