diff --git a/src/MaxCDN/OAuth/OAuthConsumer.php b/src/MaxCDN/OAuth/OAuthConsumer.php
index b016369..3d2ff75 100644
--- a/src/MaxCDN/OAuth/OAuthConsumer.php
+++ b/src/MaxCDN/OAuth/OAuthConsumer.php
@@ -8,13 +8,13 @@ class OAuthConsumer {
     public $key;
     public $secret;
 
-    function __construct($key, $secret, $callback_url=NULL) {
+    public function __construct($key, $secret, $callback_url=NULL) {
         $this->key = $key;
         $this->secret = $secret;
         $this->callback_url = $callback_url;
     }
 
-    function __toString() {
+    public function __toString() {
         return "\\MaxCDN\\OAuth\\OAuthConsumer[key=$this->key,secret=$this->secret]";
     }
 }
diff --git a/src/MaxCDN/OAuth/OAuthDataStore.php b/src/MaxCDN/OAuth/OAuthDataStore.php
index c3fb037..54ee4dd 100644
--- a/src/MaxCDN/OAuth/OAuthDataStore.php
+++ b/src/MaxCDN/OAuth/OAuthDataStore.php
@@ -2,23 +2,23 @@
 namespace MaxCDN\OAuth;
 
 class OAuthDataStore {
-    function lookup_consumer($consumer_key) {
+    public function lookup_consumer($consumer_key) {
         // implement me
     }
 
-    function lookup_token($consumer, $token_type, $token) {
+    public function lookup_token($consumer, $token_type, $token) {
         // implement me
     }
 
-    function lookup_nonce($consumer, $token, $nonce, $timestamp) {
+    public function lookup_nonce($consumer, $token, $nonce, $timestamp) {
         // implement me
     }
 
-    function new_request_token($consumer, $callback = null) {
+    public function new_request_token($consumer, $callback = null) {
         // return a new token attached to this consumer
     }
 
-    function new_access_token($token, $consumer, $verifier = null) {
+    public function new_access_token($token, $consumer, $verifier = null) {
         // return a new access token attached to this consumer
         // for the user associated with this token if the request token
         // is authorized
diff --git a/src/MaxCDN/OAuth/OAuthSignatureMethod_HMAC_SHA1.php b/src/MaxCDN/OAuth/OAuthSignatureMethod_HMAC_SHA1.php
index 5f413cc..02b57b6 100644
--- a/src/MaxCDN/OAuth/OAuthSignatureMethod_HMAC_SHA1.php
+++ b/src/MaxCDN/OAuth/OAuthSignatureMethod_HMAC_SHA1.php
@@ -9,7 +9,7 @@
 namespace MaxCDN\OAuth;
 
 class OAuthSignatureMethod_HMAC_SHA1 extends OAuthSignatureMethod {
-  function get_name() {
+  public function get_name() {
     return "HMAC-SHA1";
   }
 
diff --git a/src/MaxCDN/OAuth/OAuthToken.php b/src/MaxCDN/OAuth/OAuthToken.php
index 4c852eb..cad0e7f 100644
--- a/src/MaxCDN/OAuth/OAuthToken.php
+++ b/src/MaxCDN/OAuth/OAuthToken.php
@@ -13,7 +13,7 @@ class OAuthToken {
      * key = the token
      * secret = the token secret
      */
-    function __construct($key, $secret) {
+    public function __construct($key, $secret) {
         $this->key = $key;
         $this->secret = $secret;
     }
@@ -22,14 +22,14 @@ function __construct($key, $secret) {
      * generates the basic string serialization of a token that a server
      * would respond to request_token and access_token calls with
      */
-    function to_string() {
+    protected function to_string() {
         return "oauth_token=" .
             OAuthUtil::urlencode_rfc3986($this->key) .
             "&oauth_token_secret=" .
             OAuthUtil::urlencode_rfc3986($this->secret);
     }
 
-    function __toString() {
+    public function __toString() {
         return $this->to_string();
     }
 }