diff --git a/.drone.yml b/.drone.yml
index 7b72752..b794571 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -24,7 +24,7 @@ steps:
   - name: target-cache
     path: /drone/src/target
   commands:
-  - cargo clippy
+  - cargo clippy --deny warnings
 - name: test
   image: rustlang/rust:nightly
   volumes: