diff --git a/scripts/install b/scripts/install
index 888a4be..fdc3b5d 100644
--- a/scripts/install
+++ b/scripts/install
@@ -140,7 +140,7 @@ admin_mail=$(ynh_user_get_info $admin 'mail')
 ynh_print_info --message="Building plugins..."
 
 mkdir -p "$final_path/include/plugins/build/.config/composer"
-export COMPOSER_HOME="$final_path/include/plugins/build/.config/composer"
+COMPOSER_HOME="$final_path/include/plugins/build/.config/composer"
 
 pushd "$final_path/include/plugins/build"
 	php make.php hydrate
diff --git a/scripts/upgrade b/scripts/upgrade
index 8e39797..74dc963 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -151,7 +151,7 @@ ynh_print_info --message="Building plugins..."
 if [ "$upgrade_type" == "UPGRADE_APP" ]
 then
 	mkdir -p "$final_path/include/plugins/build/.config/composer"
-	export COMPOSER_HOME="$final_path/include/plugins/build/.config/composer"
+	COMPOSER_HOME="$final_path/include/plugins/build/.config/composer"
 	pushd "$final_path/include/plugins/build"
 		php make.php hydrate
 		php -dphar.readonly=0 make.php build auth-cas