diff --git a/README.md b/README.md
index 4e633856e..6572566fb 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ Then you can install wallabag by executing the following commands:
 git clone git@github.com:wallabag/wallabag.git
 cd wallabag
 git checkout 2.0.0-beta.2
-SYMFONY_ENV=prod composer install --no-dev
+SYMFONY_ENV=prod composer install --no-dev -o
 php bin/console wallabag:install --env=prod
 php bin/console server:run --env=prod
 ```
diff --git a/docs/en/user/installation.rst b/docs/en/user/installation.rst
index fe55b8040..f7c79ccf1 100644
--- a/docs/en/user/installation.rst
+++ b/docs/en/user/installation.rst
@@ -51,7 +51,7 @@ To install wallabag itself, you must run these two commands:
     git clone git@github.com:wallabag/wallabag.git
     cd wallabag
     git checkout 2.0.0-beta.2
-    SYMFONY_ENV=prod composer install --no-dev
+    SYMFONY_ENV=prod composer install --no-dev -o
     php bin/console wallabag:install --env=prod
     php bin/console server:run --env=prod
 
diff --git a/docs/fr/user/installation.rst b/docs/fr/user/installation.rst
index 784b06fe5..8e8e225b5 100644
--- a/docs/fr/user/installation.rst
+++ b/docs/fr/user/installation.rst
@@ -49,7 +49,7 @@ Pour installer wallabag, vous devez exécuter ces deux commandes :
     git clone git@github.com:wallabag/wallabag.git
     cd wallabag
     git checkout 2.0.0-beta.2
-    SYMFONY_ENV=prod composer install --no-dev
+    SYMFONY_ENV=prod composer install --no-dev -o
     php bin/console wallabag:install --env=prod
     php bin/console server:run --env=prod