diff --git a/install/usr/share/swarmlab.io/sec/swarmlab-sec b/install/usr/share/swarmlab.io/sec/swarmlab-sec
index b014ad0..a530b2d 100755
--- a/install/usr/share/swarmlab.io/sec/swarmlab-sec
+++ b/install/usr/share/swarmlab.io/sec/swarmlab-sec
@@ -45,7 +45,6 @@ hostnames="auto_update_hosts"
 hostnames_get="get_hosts"
 NODENAME=${HYBRID_NETWORK}_master_1.${HYBRID_NETWORK}_${HYBRID_NETWORK}
 NODENETWORK=${HYBRID_NETWORK}
-DISPLAY=$DISPLAY
 # shellcheck disable=SC1091
 #. ./.env
 
@@ -323,7 +322,7 @@ services:
     environment:
      - NODENAME=${NODENAME}
      - NODENETWORK=${NODENETWORK}
-     - DISPLAY="${DISPLAY}" 
+     - DISPLAY=\${DISPLAY}
     cap_add:
       - NET_ADMIN
     user: root