diff --git a/Dockerfile.jetty b/Dockerfile.jetty
index f2f882f..cfc7043 100644
--- a/Dockerfile.jetty
+++ b/Dockerfile.jetty
@@ -15,7 +15,7 @@ USER root
 
 RUN apt-get update && \
     apt-get install -y --no-install-recommends graphviz fonts-noto-cjk && \
-    apt-get clean && rm -rf /var/lib/apt/lists/*
+    rm -rf /var/lib/apt/lists/*
 
 USER jetty
 
diff --git a/Dockerfile.tomcat b/Dockerfile.tomcat
index 255c9d0..a816a3c 100644
--- a/Dockerfile.tomcat
+++ b/Dockerfile.tomcat
@@ -28,7 +28,7 @@ MAINTAINER D.Ducatel
 
 RUN apt-get update && \
     apt-get install -y --no-install-recommends fonts-noto-cjk libexpat1 libcairo2 libpango1.0 libpangoft2-1.0 libpangocairo-1.0 && \
-    apt-get clean && rm -rf /var/lib/apt/lists/*
+    rm -rf /var/lib/apt/lists/*
 
 ENV GRAPHVIZ_DOT=/usr/bin/dot