diff --git a/install/usr/share/swarmlab.io/sec/swarmlab-sec b/install/usr/share/swarmlab.io/sec/swarmlab-sec
index 3ca829b..fdec60a 100755
--- a/install/usr/share/swarmlab.io/sec/swarmlab-sec
+++ b/install/usr/share/swarmlab.io/sec/swarmlab-sec
@@ -158,14 +158,14 @@ ENV UID=12345
 ENV GID=23456
 
 RUN export DEBIAN_FRONTEND=noninteractive  \
-    && addgroup -g $GID $GROUP_NAME  \
+    && addgroup -g \${GID} \${GROUP_NAME}  \
     && adduser \
     --disabled-password \
     --gecos "" \
     --home "/home/docker" \
-    --ingroup "$GROUP_NAME" \
-    --uid "$UID" \
-    "$USER"
+    --ingroup "\${GROUP_NAME}" \
+    --uid "\${UID}" \
+    "\${USER}"
 
 CMD ["tail","-f","/dev/null"]
 
@@ -233,14 +233,14 @@ ENV UID=12345
 ENV GID=23456
 
 RUN export DEBIAN_FRONTEND=noninteractive  \
-    && addgroup -g $GID $GROUP_NAME  \
+    && addgroup -g \${GID} \${GROUP_NAME}  \
     && adduser \
     --disabled-password \
     --gecos "" \
     --home "/home/docker" \
-    --ingroup "$GROUP_NAME" \
-    --uid "$UID" \
-    "$USER"
+    --ingroup "\${GROUP_NAME}" \
+    --uid "\${UID}" \
+    "\${USER}"
 
 CMD ["tail","-f","/dev/null"]