diff --git a/Dockerfile b/Dockerfile
index 78da27c..59e996d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,21 +1,20 @@
 FROM "ubuntu:18.04"
 MAINTAINER "Julien Cabillot <dockerimages@cabillot.eu>"
 
-
 RUN apt-get -qq update && \
     apt-get -qq --yes install ruby ruby-dev libxml2-dev && \
     gem install foodcritic && \
     apt-get -qq --yes remove --purge libxml2-dev ruby-dev unzip zip fonts-lato javascript-common libjs-jquery  && \
     apt-get -qq --yes autoremove --purge && \
     apt-get -qq --yes clean all && \
-    rm -rf "/usr/share/doc/*" \
-           "/var/cache/*" \
-           "/var/lib/apt/lists/*" \
-           "/usr/src/*" \
-           "/var/cache/*" \
+    rm -rf "/usr/share/doc/"* \
+           "/var/cache/"* \
+           "/var/lib/apt/lists/"* \
+           "/usr/src/"* \
+           "/var/cache/"* \
            "/var/log/"{apt/*,dpkg.log} \
            "/var/www/html" \
-           "/tmp/*"
+           "/tmp/"*
 
 WORKDIR /data