diff --git a/rel/server/env.sh.eex b/rel/server/env.sh.eex
index 2c32e2ffa..7172199cd 100644
--- a/rel/server/env.sh.eex
+++ b/rel/server/env.sh.eex
@@ -1,7 +1,7 @@
 if [ "$LIVEBOOK_CLUSTER" = "auto" ] && [ ! -z "$FLY_APP_NAME" ]; then
   export ERL_AFLAGS="-proto_dist inet6_tcp"
   export LIVEBOOK_CLUSTER="dns:${FLY_APP_NAME}.internal"
-  if [ ! -z "${LIVEBOOK_NODE}" ];
+  if [ -z "${LIVEBOOK_NODE}" ];
     then export LIVEBOOK_NODE="${FLY_APP_NAME}-${FLY_IMAGE_REF##*-}@${FLY_PRIVATE_IP}";
   fi
 fi