diff --git a/src/Entities/AccessTokenEntityInterface.php b/src/Entities/AccessTokenEntityInterface.php
index 5d69eefd..5729c3fc 100644
--- a/src/Entities/AccessTokenEntityInterface.php
+++ b/src/Entities/AccessTokenEntityInterface.php
@@ -16,5 +16,5 @@ interface AccessTokenEntityInterface extends TokenInterface
     /**
      * Generate a string representation from the access token
      */
-    public function convertToAccessToken(CryptKey $privateKey): string;
+    public function convertToAccessToken(CryptKey $privateKey);
 }
diff --git a/src/Entities/Traits/AccessTokenTrait.php b/src/Entities/Traits/AccessTokenTrait.php
index fab41c46..c2ee70a6 100644
--- a/src/Entities/Traits/AccessTokenTrait.php
+++ b/src/Entities/Traits/AccessTokenTrait.php
@@ -43,7 +43,7 @@ trait AccessTokenTrait
     /**
      * Generate a string representation from the access token
      */
-    public function convertToAccessToken(CryptKey $privateKey): string
+    public function convertToAccessToken(CryptKey $privateKey)
     {
         return (string) $this->convertToJWT($privateKey);
     }