diff --git a/shadowvpn/Dockerfile b/shadowvpn/Dockerfile
index 14e2807..195ca18 100644
--- a/shadowvpn/Dockerfile
+++ b/shadowvpn/Dockerfile
@@ -7,7 +7,7 @@ MAINTAINER kev <noreply@datageek.info>
 
 WORKDIR /
 RUN apt-get update
-RUN apt-get install build-essential automake libtool debhelper gawk git
+RUN apt-get install -y build-essential automake libtool debhelper gawk git
 RUN git clone --recursive https://github.com/clowwindy/ShadowVPN.git
 
 WORKDIR /ShadowVPN