diff --git a/api/v3/TwingleSync/BAO/TwingleApiCall.php b/api/v3/TwingleSync/BAO/TwingleApiCall.php
index f9c09fa..a81f961 100644
--- a/api/v3/TwingleSync/BAO/TwingleApiCall.php
+++ b/api/v3/TwingleSync/BAO/TwingleApiCall.php
@@ -57,7 +57,7 @@ class TwingleApiCall {
    *
    * @return mixed
    */
-  public function getProject($projectId = NULL) {
+  public function getProject(int $projectId = NULL) {
     $response = [];
     foreach ($this->organisationId as $organisationId) {
       $url = empty($projectId)