diff --git a/tools/init-topic.sh b/tools/init-topic.sh
index 6f64b2d..0403b4b 100755
--- a/tools/init-topic.sh
+++ b/tools/init-topic.sh
@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 topic="megaphone-control"
 $KAFKA/bin/kafka-configs.sh --zookeeper localhost --alter --entity-type topics --entity-name $topic --add-config retention.ms=1000
 $KAFKA/bin/kafka-topics.sh --delete --zookeeper localhost:2181 --topic $topic