diff --git a/modules/infra-kafka-cluster/src/entrypoint.sh b/modules/infra-kafka-cluster/src/entrypoint.sh
index 9a21f3f..b89913c 100644
--- a/modules/infra-kafka-cluster/src/entrypoint.sh
+++ b/modules/infra-kafka-cluster/src/entrypoint.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 # Format storage directories
 RUN ./bin/kafka-storage.sh format \
   --ignore-formatted \