diff --git a/plugin/lti_provider/Entity/PlatformKey.php b/plugin/lti_provider/Entity/PlatformKey.php
index 404d588788..8bcfb0db35 100755
--- a/plugin/lti_provider/Entity/PlatformKey.php
+++ b/plugin/lti_provider/Entity/PlatformKey.php
@@ -81,6 +81,8 @@ class PlatformKey
     public function setKid(string $kid)
     {
         $this->kid = $kid;
+
+        return $this;
     }
 
     /**
@@ -121,5 +123,7 @@ class PlatformKey
     public function setPublicKey(string $publicKey)
     {
         $this->publicKey = $publicKey;
+
+        return $this;
     }
 }