diff --git a/tools/release/native/Dockerfile b/tools/release/native/Dockerfile
index 4af3c3d0..40665df1 100644
--- a/tools/release/native/Dockerfile
+++ b/tools/release/native/Dockerfile
@@ -2,7 +2,7 @@ FROM debian:jessie
 
 RUN echo "deb http://ftp.debian.org/debian jessie-backports main" > /etc/apt/sources.list.d/backports.list
 RUN apt-get update
-RUN apt-get -t jessie-backports install cmake
+RUN apt-get -t jessie-backports install -y cmake
 RUN apt-get install -y curl build-essential python libc6-dev-i386 lib32stdc++-4.9-dev jq
 RUN curl -fsSL get.docker.com | bash