diff --git a/linux-x64/Dockerfile b/linux-x64/Dockerfile
index df0d867..c87c35b 100644
--- a/linux-x64/Dockerfile
+++ b/linux-x64/Dockerfile
@@ -2,7 +2,8 @@ FROM dockcross/base:latest
 MAINTAINER Matt McCormick "matt.mccormick@kitware.com"
 
 RUN apt-get update && apt-get -y install \
-    libelf-dev
+    libelf-dev && \
+    apt-get clean --yes
 
 ENV CROSS_TRIPLE x86_64-linux-gnu
 ENV CROSS_ROOT /usr/bin