diff --git a/src/OAuth2/AuthServer.php b/src/OAuth2/AuthServer.php
index e9e302f5..d49be227 100644
--- a/src/OAuth2/AuthServer.php
+++ b/src/OAuth2/AuthServer.php
@@ -356,11 +356,11 @@ class AuthServer
 
     /**
      * Set the TTL for an access token
-     * @param int $expiresIn The new TTL
+     * @param int $accessTokenTTL The new TTL
      */
-    public function setExpiresIn($expiresIn)
+    public function setAcessTokenTTL($accessTokenTTL)
     {
-        $this->expiresIn = $expiresIn;
+        $this->accessTokenTTL = $accessTokenTTL;
     }
 
     /**
diff --git a/src/OAuth2/Grant/AuthCode.php b/src/OAuth2/Grant/AuthCode.php
index 67dc2234..4433bf56 100644
--- a/src/OAuth2/Grant/AuthCode.php
+++ b/src/OAuth2/Grant/AuthCode.php
@@ -46,7 +46,7 @@ class AuthCode implements GrantTypeInterface {
      * Access token expires in override
      * @var int
      */
-    protected $expiresIn = null;
+    protected $accessTokenTTL = null;
 
     /**
      * Constructor
@@ -78,12 +78,12 @@ class AuthCode implements GrantTypeInterface {
 
     /**
      * Override the default access token expire time
-     * @param int $expiresIn
+     * @param int $accessTokenTTL
      * @return void
      */
-    public function setExpiresIn($expiresIn)
+    public function setAccessTokenTTL($accessTokenTTL)
     {
-        $this->expiresIn = $expiresIn;
+        $this->accessTokenTTL = $accessTokenTTL;
     }
 
     /**
@@ -238,7 +238,7 @@ class AuthCode implements GrantTypeInterface {
         // A session ID was returned so update it with an access token and remove the authorisation code
 
         $accessToken = SecureKey::make();
-        $accessTokenExpiresIn = ($this->expiresIn !== null) ? $this->expiresIn : $this->authServer->getExpiresIn();
+        $accessTokenExpiresIn = ($this->accessTokenTTL !== null) ? $this->accessTokenTTL : $this->authServer->getExpiresIn();
         $accessTokenExpires = time() + $accessTokenExpiresIn;
 
         // Remove the auth code
diff --git a/src/OAuth2/Grant/ClientCredentials.php b/src/OAuth2/Grant/ClientCredentials.php
index 5d2a48a9..489bc5a5 100644
--- a/src/OAuth2/Grant/ClientCredentials.php
+++ b/src/OAuth2/Grant/ClientCredentials.php
@@ -46,7 +46,7 @@ class ClientCredentials implements GrantTypeInterface {
      * Access token expires in override
      * @var int
      */
-    protected $expiresIn = null;
+    protected $accessTokenTTL = null;
 
     /**
      * Constructor
@@ -78,12 +78,12 @@ class ClientCredentials implements GrantTypeInterface {
 
     /**
      * Override the default access token expire time
-     * @param int $expiresIn
+     * @param int $accessTokenTTL
      * @return void
      */
-    public function setExpiresIn($expiresIn)
+    public function setAccessTokenTTL($accessTokenTTL)
     {
-        $this->expiresIn = $expiresIn;
+        $this->accessTokenTTL = $accessTokenTTL;
     }
 
     /**
@@ -142,7 +142,7 @@ class ClientCredentials implements GrantTypeInterface {
 
         // Generate an access token
         $accessToken = SecureKey::make();
-        $accessTokenExpiresIn = ($this->expiresIn !== null) ? $this->expiresIn : $this->authServer->getExpiresIn();
+        $accessTokenExpiresIn = ($this->accessTokenTTL !== null) ? $this->accessTokenTTL : $this->authServer->getExpiresIn();
         $accessTokenExpires = time() + $accessTokenExpiresIn;
 
         // Delete any existing sessions just to be sure
diff --git a/src/OAuth2/Grant/Password.php b/src/OAuth2/Grant/Password.php
index dbc94eb9..31cc7080 100644
--- a/src/OAuth2/Grant/Password.php
+++ b/src/OAuth2/Grant/Password.php
@@ -52,7 +52,7 @@ class Password implements GrantTypeInterface {
      * Access token expires in override
      * @var int
      */
-    protected $expiresIn = null;
+    protected $accessTokenTTL = null;
 
     /**
      * Constructor
@@ -84,12 +84,12 @@ class Password implements GrantTypeInterface {
 
     /**
      * Override the default access token expire time
-     * @param int $expiresIn
+     * @param int $accessTokenTTL
      * @return void
      */
-    public function setExpiresIn($expiresIn)
+    public function setAccessTokenTTL($accessTokenTTL)
     {
-        $this->expiresIn = $expiresIn;
+        $this->accessTokenTTL = $accessTokenTTL;
     }
 
     /**
@@ -185,7 +185,7 @@ class Password implements GrantTypeInterface {
 
         // Generate an access token
         $accessToken = SecureKey::make();
-        $accessTokenExpiresIn = ($this->expiresIn !== null) ? $this->expiresIn : $this->authServer->getExpiresIn();
+        $accessTokenExpiresIn = ($this->accessTokenTTL !== null) ? $this->accessTokenTTL : $this->authServer->getExpiresIn();
         $accessTokenExpires = time() + $accessTokenExpiresIn;
 
         // Delete any existing sessions just to be sure
diff --git a/src/OAuth2/Grant/RefreshToken.php b/src/OAuth2/Grant/RefreshToken.php
index 586c482f..6869f0ca 100644
--- a/src/OAuth2/Grant/RefreshToken.php
+++ b/src/OAuth2/Grant/RefreshToken.php
@@ -46,7 +46,7 @@ class RefreshToken implements GrantTypeInterface {
      * Access token expires in override
      * @var int
      */
-    protected $expiresIn = null;
+    protected $accessTokenTTL = null;
 
     /**
      * Constructor
@@ -78,12 +78,12 @@ class RefreshToken implements GrantTypeInterface {
 
     /**
      * Override the default access token expire time
-     * @param int $expiresIn
+     * @param int $accessTokenTTL
      * @return void
      */
-    public function setExpiresIn($expiresIn)
+    public function setAccessTokenTTL($accessTokenTTL)
     {
-        $this->expiresIn = $expiresIn;
+        $this->accessTokenTTL = $accessTokenTTL;
     }
 
     /**
@@ -132,7 +132,7 @@ class RefreshToken implements GrantTypeInterface {
 
         // Generate new tokens and associate them to the session
         $accessToken = SecureKey::make();
-        $accessTokenExpiresIn = ($this->expiresIn !== null) ? $this->expiresIn : $this->authServer->getExpiresIn();
+        $accessTokenExpiresIn = ($this->accessTokenTTL !== null) ? $this->accessTokenTTL : $this->authServer->getExpiresIn();
         $accessTokenExpires = time() + $accessTokenExpiresIn;
         $refreshToken = SecureKey::make();