diff --git a/.build.yml b/.build.yml
index 5c2adb3..77a3f5e 100644
--- a/.build.yml
+++ b/.build.yml
@@ -2,6 +2,7 @@ image: alpine/edge
 packages:
     - rust 
     - cargo
+    - rustfmt
 
 sources:
   - https://git.sr.ht/~victormignot/yorokobot