diff --git a/18.04/Dockerfile b/18.04/Dockerfile
index 63ac169..91fb745 100644
--- a/18.04/Dockerfile
+++ b/18.04/Dockerfile
@@ -14,7 +14,7 @@ RUN sed -ri 's/UsePAM yes/#UsePAM yes/g' /etc/ssh/sshd_config
 RUN mkdir /root/.ssh
 
 RUN apt-get clean && \
-    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+    rm -rf /tmp/* /var/tmp/*
 
 EXPOSE 22