diff --git a/setup/functions.sh b/setup/functions.sh
index 947aa5ab..00cc4d90 100644
--- a/setup/functions.sh
+++ b/setup/functions.sh
@@ -48,6 +48,15 @@ function apt_install {
 	apt_get_quiet install $PACKAGES
 }
 
+function apt_add_repository_to_unattended_upgrades {
+	if [ -f /etc/apt/apt.conf.d/50unattended-upgrades ]; then
+		if ! grep -q "$1" /etc/apt/apt.conf.d/50unattended-upgrades; then
+			sed -i "/Allowed-Origins/a \
+	    \"$1\";" /etc/apt/apt.conf.d/50unattended-upgrades
+		fi
+	fi
+}
+
 function get_default_hostname {
 	# Guess the machine's hostname. It should be a fully qualified
 	# domain name suitable for DNS. None of these calls may provide
diff --git a/setup/owncloud.sh b/setup/owncloud.sh
index 75523441..7fa92418 100755
--- a/setup/owncloud.sh
+++ b/setup/owncloud.sh
@@ -18,6 +18,7 @@ apt-get purge -qq -y owncloud*
 
 # Install php-7 from the ppa of the ubuntu php maintainer Ondřej Surý located here https://launchpad.net/%7Eondrej/+archive/ubuntu/php
 hide_output add-apt-repository -y ppa:ondrej/php
+apt_add_repository_to_unattended_upgrades LP-PPA-ondrej-php:trusty
 hide_output apt-get update
 apt_install php7.0 php7.0-fpm \
 	php7.0-cli php7.0-sqlite php7.0-gd php7.0-imap php7.0-curl php-pear php-apc curl \