diff --git a/.drone.yml b/.drone.yml
index 0e09e58..e32bcd6 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -23,6 +23,7 @@ steps:
     - name: tree
       image: alpine:latest
       commands:
+          - apk add tree
           - tree -a public/
 
 ---
@@ -51,6 +52,7 @@ steps:
     - name: tree
       image: alpine:latest
       commands:
+          - apk add tree
           - tree -a public/
 
     - name: deploy