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-rw-r--r--tests/docker/dockerfiles/travis.docker2
1 files changed, 1 insertions, 1 deletions
diff --git a/tests/docker/dockerfiles/travis.docker b/tests/docker/dockerfiles/travis.docker
index 03ebfb0ef2..46cf367488 100644
--- a/tests/docker/dockerfiles/travis.docker
+++ b/tests/docker/dockerfiles/travis.docker
@@ -2,7 +2,7 @@ FROM travisci/ci-garnet:packer-1512502276-986baf0
ENV DEBIAN_FRONTEND noninteractive
ENV LANG en_US.UTF-8
ENV LC_ALL en_US.UTF-8
-RUN cat /etc/apt/sources.list | sed "s/# deb-src/deb-src/" >> /etc/apt/sources.list
+RUN sed -i "s/# deb-src/deb-src/" /etc/apt/sources.list
RUN apt-get update
RUN apt-get -y build-dep qemu
RUN apt-get -y install device-tree-compiler python2.7 python-yaml dh-autoreconf gdb strace lsof net-tools gcovr