diff --git a/.drone.yml b/.drone.yml
index 797c3d2..d95d49d 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -7,5 +7,5 @@ steps:
   - name: ShellCheck
     image: koalaman/shellcheck-alpine:v0.7.1
     commands:
-      - shellcheck pdf-optimize
+      - shellcheck -e SC2181 pdf-optimize
 ...