diff --git a/scripts/_common.sh b/scripts/_common.sh
index 0307809..43e79e2 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -12,6 +12,12 @@ swap_needed=512
 # PERSONAL HELPERS
 #=================================================
 
+_ynh_exec_with_drush_php() {
+    ynh_exec_warn_less ynh_exec_as "$app" \
+        env PATH="$PATH" DRUSH_PHP="/usr/bin/php$phpversion" \
+        "$@"
+}
+
 #=================================================
 # EXPERIMENTAL HELPERS
 #=================================================
diff --git a/scripts/install b/scripts/install
index e435286..f11c405 100644
--- a/scripts/install
+++ b/scripts/install
@@ -80,20 +80,17 @@ chmod -R o-rwx "$install_dir"
 chown -R "$app:www-data" "$install_dir"
 
 pushd "$install_dir"
-    ynh_exec_warn_less ynh_exec_as $app \
-        env PATH=$PATH \
-        drush site:install $install_profil \
-        --account-name=$admin \
-        --account-pass=$password \
-        --account-mail=$admin_mail \
-        --db-url=mysql://$db_user:$db_pwd@localhost/$db_name \
+    _ynh_exec_with_drush_php \
+        drush site:install "$install_profil" \
+        --account-name="$admin" \
+        --account-pass="$password" \
+        --account-mail="$admin_mail" \
+        --db-url="mysql://$db_user:$db_pwd@localhost/$db_name" \
         --site-name="$app" \
         --locale=$language \
         --yes
 popd
 
-update-alternatives --set php /usr/bin/php${YNH_DEFAULT_PHP_VERSION}
-
 #=================================================
 # SETUP THE CRON FILE
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 3f6e5e6..ea6743d 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -75,19 +75,15 @@ ynh_backup_if_checksum_is_different --file="$install_dir/$app/sites/default/sett
 chmod -R o-rwx "$install_dir"
 chown -R "$app:www-data" "$install_dir"
 
-update-alternatives --set php /usr/bin/php$phpversion
-
 pushd "$install_dir"
-    ynh_exec_warn_less ynh_exec_as $app env PATH=$PATH drush @$app.prod state:set system.maintenance_mode 1 --input-format=integer
-    ynh_exec_warn_less ynh_exec_as $app env PATH=$PATH php composer.phar update drupal/core webflo/drupal-core-require-dev --with-dependencies
-    ynh_exec_warn_less ynh_exec_as $app env PATH=$PATH php composer.phar update --with-dependencies
-    ynh_exec_warn_less ynh_exec_as $app env PATH=$PATH drush @$app.prod -y updatedb
-    ynh_exec_warn_less ynh_exec_as $app env PATH=$PATH drush @$app.prod cache:rebuild
-    ynh_exec_warn_less ynh_exec_as $app env PATH=$PATH drush @$app.prod state:set system.maintenance_mode 0 --input-format=integer
+    _ynh_exec_with_drush_php drush "@$app.prod" state:set system.maintenance_mode 1 --input-format=integer
+    _ynh_exec_with_drush_php php composer.phar update drupal/core webflo/drupal-core-require-dev --with-dependencies
+    _ynh_exec_with_drush_php php composer.phar update --with-dependencies
+    _ynh_exec_with_drush_php drush "@$app.prod" -y updatedb
+    _ynh_exec_with_drush_php drush "@$app.prod" cache:rebuild
+    _ynh_exec_with_drush_php drush "@$app.prod" state:set system.maintenance_mode 0 --input-format=integer
 popd
 
-update-alternatives --set php /usr/bin/php${YNH_DEFAULT_PHP_VERSION}
-
 #=================================================
 # STORE THE CONFIG FILE CHECKSUM
 #=================================================