diff --git a/.docker/install_cpplib.sh b/.docker/install_cpplib.sh
old mode 100644
new mode 100755
index a48d8f1d6f09c271b1223b94399a3e4d1cc12c5d..d7a5abb4f41ab04d6aba1474bb89b0994b3cb148
--- a/.docker/install_cpplib.sh
+++ b/.docker/install_cpplib.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 git clone https://gitlab.indiscale.com/caosdb/src/caosdb-cpplib.git
 git checkout f-extern-c
 git submodule update --init --recursive