diff --git a/plugin.sh b/plugin.sh
index 97b1f0b..1c14bad 100755
--- a/plugin.sh
+++ b/plugin.sh
@@ -58,7 +58,7 @@ run_stack_wait() {
 
 run_purge() {
   echo "--- start purge ---"
-  docker -H "$DOCKER_HOST" prune --all --volumes --force
+  docker -H "$DOCKER_HOST" system prune --all --volumes --force
   echo "--- end purge ---"
 }