diff --git a/Dockerfile b/Dockerfile
index 2a112e9..d3bc055 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,9 @@
-FROM php:apache
+FROM "php:7.1-apache"
 
-USER www-data
+USER "www-data"
 RUN curl -L "https://download.dokuwiki.org/src/dokuwiki/dokuwiki-stable.tgz" | tar -zx --strip=1
-USER root
+# TODO: utiliser un utilisateur www-data
+USER "root"
 
-HEALTHCHECK --interval=10s \
-    CMD curl --fail "http://localhost" || exit 1
\ No newline at end of file
+HEALTHCHECK --interval="10s" \
+    CMD curl --fail "http://localhost" || exit 1