diff --git a/openvidu-server/docker/openvidu-server-kms/Dockerfile b/openvidu-server/docker/openvidu-server-kms/Dockerfile
index 2abb7511..c9f397e3 100644
--- a/openvidu-server/docker/openvidu-server-kms/Dockerfile
+++ b/openvidu-server/docker/openvidu-server-kms/Dockerfile
@@ -2,7 +2,7 @@ FROM ubuntu:16.04
 MAINTAINER openvidu@gmail.com
 
 # Install Kurento Media Server (KMS) 
-RUN echo "deb http://ubuntu.openvidu.io/6.9.0 xenial kms6" | tee /etc/apt/sources.list.d/kurento.list \
+RUN echo "deb [arch=amd64] http://ubuntu.openvidu.io/6.9.0 xenial kms6" | tee /etc/apt/sources.list.d/kurento.list \
 	&& apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 5AFA7A83 \
 	&& apt-get update \
 	&& apt-get -y install kurento-media-server \
diff --git a/openvidu-testapp/docker/Dockerfile b/openvidu-testapp/docker/Dockerfile
index 87f5d133..849344d3 100644
--- a/openvidu-testapp/docker/Dockerfile
+++ b/openvidu-testapp/docker/Dockerfile
@@ -2,7 +2,7 @@ FROM ubuntu:16.04
 MAINTAINER openvidu@gmail.com
 
 # Install Kurento Media Server (KMS) 
-RUN echo "deb http://ubuntu.openvidu.io/6.7.2 xenial kms6" | tee /etc/apt/sources.list.d/kurento.list \
+RUN echo "deb [arch=amd64] http://ubuntu.openvidu.io/6.7.2 xenial kms6" | tee /etc/apt/sources.list.d/kurento.list \
 	&& apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 5AFA7A83 \
 	&& apt-get update \
 	&& apt-get -y dist-upgrade \