diff --git a/drone.yml b/drone.yml
index 799a0e6..58bb809 100644
--- a/drone.yml
+++ b/drone.yml
@@ -12,6 +12,7 @@ steps:
     - "npm install"
     - "node node_modules/@angular/cli/bin/ng build --prod --configuration=production"
     - "cd ../"
+    - "apt install tree"
     - "tree"
   when:
     event: