diff --git a/src/application/controllers/Backend_api.php b/src/application/controllers/Backend_api.php
index 6c22c2d2..d41d1fdb 100644
--- a/src/application/controllers/Backend_api.php
+++ b/src/application/controllers/Backend_api.php
@@ -390,7 +390,7 @@ class Backend_api extends CI_Controller {
                     if ($google_sync == TRUE) {
                         $google_token = json_decode($this->providers_model
                                 ->get_setting('google_token', $provider['id']));
-                        $this->load->library('Google_Sync');
+                        $this->load->library('Google_sync');
                         $this->google_sync->refresh_token($google_token->refresh_token);
                         $this->google_sync->delete_appointment($provider, $appointment['id_google_calendar']);
                     }
diff --git a/src/application/controllers/Google.php b/src/application/controllers/Google.php
index f8eac117..f61665d7 100644
--- a/src/application/controllers/Google.php
+++ b/src/application/controllers/Google.php
@@ -63,7 +63,7 @@ class Google extends CI_Controller {
      */
     public function oauth_callback() {
        	if (isset($_GET['code'])) {
-            $this->load->library('Google_Sync');
+            $this->load->library('Google_sync');
             $token = $this->google_sync->authenticate($_GET['code']);
 
        		// Store the token into the database for future reference.