diff --git a/Dockerfile b/Dockerfile
index 5e4e32e..7fdf3c9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ ADD https://github.com/upx/upx/releases/download/v3.95/upx-3.95-amd64_linux.tar.
 RUN xz -d -c /usr/local/upx-3.95-amd64_linux.tar.xz | tar -xOf - upx-3.95-amd64_linux/upx > /bin/upx && \
     chmod a+x /bin/upx
 
-RUN /bin/upx
+RUN /bin/upx --help
 
 ADD release/linux/amd64/drone-upx /bin/