diff --git a/docker/tensorrt/install_python_39.sh b/docker/tensorrt/install_python_39.sh
index 5d214daa4..04e2d4bb6 100755
--- a/docker/tensorrt/install_python_39.sh
+++ b/docker/tensorrt/install_python_39.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 function package_exists() {
     return dpkg -l "$1" &> /dev/null
 }