diff --git a/scripts/upgrade b/scripts/upgrade
index 412a2b1..2144d7c 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -119,8 +119,8 @@ exec_occ() {
     fi
     if ! timeout 1 php$NEXTCLOUD_PHP_VERSION 2>/dev/null; then
         local pkg_dependencies = $(dpkg-query --show --showformat='${Depends}' ${app}-ynh-deps)
-        pkg_dependencies=${pkg_dependencies/$phpversion/$NEXTCLOUD_PHP_VERSION}
-        ynh_install_app_dependencies $pkg_dependencies
+        pkg_dependencies="${pkg_dependencies/$phpversion/$NEXTCLOUD_PHP_VERSION}"
+        ynh_install_app_dependencies "$pkg_dependencies"
     fi 
 (cd "$install_dir" && ynh_exec_as "$app" \
     php$NEXTCLOUD_PHP_VERSION --define apc.enable_cli=1 occ --no-interaction --no-ansi "$@")