diff --git a/guestbook/php-redis/Dockerfile b/guestbook/php-redis/Dockerfile
index 16df47ca9..c7a2cc49b 100644
--- a/guestbook/php-redis/Dockerfile
+++ b/guestbook/php-redis/Dockerfile
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM php:5-apache
+FROM docker.io/library/php:5-apache
 
 RUN pear channel-discover pear.nrk.io
 RUN pear install nrk/Predis
@@ -21,9 +21,10 @@ RUN pear install nrk/Predis
 # /proc/self/fd/{1,2} are Unix sockets and apache will not be able to open()
 # them. Use "cat" to write directly to the already opened fds without opening
 # them again.
-RUN sed -i 's#ErrorLog /proc/self/fd/2#ErrorLog "|$/bin/cat 1>\&2"#' /etc/apache2/apache2.conf
-RUN sed -i 's#CustomLog /proc/self/fd/1 combined#CustomLog "|/bin/cat" combined#' /etc/apache2/apache2.conf
+RUN sed -i \
+    -e 's#ErrorLog /proc/self/fd/2#ErrorLog "|/bin/cat 1>&2"#' \
+    -e 's#CustomLog /proc/self/fd/1 combined#CustomLog "|/bin/cat" combined#' \
+    /etc/apache2/apache2.conf
 
-ADD guestbook.php /var/www/html/guestbook.php
-ADD controllers.js /var/www/html/controllers.js
-ADD index.html /var/www/html/index.html
+# Copy application files
+COPY guestbook.php controllers.js index.html /var/www/html/