diff --git a/wud/stack.env b/wud/stack.env
index e6010f4..11829eb 100644
--- a/wud/stack.env
+++ b/wud/stack.env
@@ -41,6 +41,7 @@ WUD_TRIGGER_GOTIFY_EXTERNAL_ONCE=true
 WUD_TRIGGER_DOCKER_MSERVER_PRUNE=true
 WUD_TRIGGER_DOCKER_RPI5_PRUNE=true
 WUD_TRIGGER_DOCKER_NAS_PRUNE=true
+WUD_TRIGGER_DOCKER_RACK_PRUNE=true
 # error info debug trace
 WUD_LOG_LEVEL=debug
 # text json