diff --git a/test/ete/labs/tlab/apt-proxy.sh b/test/ete/labs/tlab/apt-proxy.sh
index 3cf5474..9203844 100755
--- a/test/ete/labs/tlab/apt-proxy.sh
+++ b/test/ete/labs/tlab/apt-proxy.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-sed -i '/#!\/bin\/bash/a\
+sed -i '/^            #!\/bin\/bash/a\
             mkdir -p /etc/docker\
             cat > /etc/docker/daemon.json <<EOF\
             {\