diff --git a/src/test/docker/Dockerfile b/src/test/docker/Dockerfile
index ec670b7d4b43709054e9794f501aea111a059a0a..1752f88c159a1d6d950b30c7bf6dac32c8823b06 100644
--- a/src/test/docker/Dockerfile
+++ b/src/test/docker/Dockerfile
@@ -4,7 +4,7 @@ RUN apt-get update && \
     git make mariadb-server maven openjdk-11-jdk-headless \
     plantuml \
     python3-pip screen libpam0g-dev unzip curl shunit2 \
-    python3-sphinx \
+    python3-sphinx
 
 RUN pip3 install javasphinx recommonmark sphinx-rtd-theme sphinxcontrib-plantuml sphinx-a4doc