diff --git a/scripts/upgrade b/scripts/upgrade
index 9d11edf..5dd1497 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -16,7 +16,7 @@ ynh_app_setting_delete --app=$app --key=backup_core_only
 # If phpflags doesn't exist, create it
 if [ -z "${phpflags:-}" ]; then
 	phpflags="--define apc.enable_cli=1"
-	ynh_app_setting_set --app=$app --key=phpflags --value=$phpflags
+	ynh_app_setting_set --app=$app --key=phpflags --value="$phpflags"
 fi
 
 if ynh_compare_current_package_version --comparison lt --version 22.2~ynh1