diff --git a/jekyll/rootfs/srv/jekyll/container-test.sh b/jekyll/rootfs/srv/jekyll/container-test.sh
index 08d4cbc..b05b470 100755
--- a/jekyll/rootfs/srv/jekyll/container-test.sh
+++ b/jekyll/rootfs/srv/jekyll/container-test.sh
@@ -3,6 +3,6 @@ set -euo pipefail
 
 jekyll --version
 
-plantuml --version
+plantuml -version
 
 plantuml -testdot
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