diff --git a/helpers/php b/helpers/php
index 7fbe3f1ba..0a1751e84 100644
--- a/helpers/php
+++ b/helpers/php
@@ -533,7 +533,7 @@ ynh_composer_exec() {
     fi
 
     COMPOSER_HOME="$workdir/.composer" COMPOSER_MEMORY_LIMIT=-1 \
-        php${phpversion} "$workdir/composer.phar" $commands \
+        sudo -u "$app" php${phpversion} "$workdir/composer.phar" $commands \
         -d "$workdir" --no-interaction --no-ansi 2>&1
 }