diff --git a/system/libraries/User_agent.php b/system/libraries/User_agent.php
index ff596f0..3387d4a 100644
--- a/system/libraries/User_agent.php
+++ b/system/libraries/User_agent.php
@@ -466,7 +466,13 @@
 	 */
 	public function is_referral()
 	{
-		return ! empty($_SERVER['HTTP_REFERER']);
+		if (empty($_SERVER['HTTP_REFERER']))
+		{
+			return FALSE;
+		}
+
+		$referer = parse_url($_SERVER['HTTP_REFERER']);
+		return ! (empty($referer['host']) && strpos(config_item('base_url'), $referer['host']) !== FALSE);
 	}
 
 	// --------------------------------------------------------------------
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index ca46e9d..afe2a68 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -378,6 +378,7 @@
 -  Fixed a bug (#779) - :doc:`URI Class <libraries/uri>` didn't always trim slashes from the *uri_string* as shown in the documentation.
 -  Fixed a bug (#134) - :doc:`Database Caching <database/caching>` method ``delete_cache()`` didn't work in some cases due to *cachedir* not being initialized properly.
 -  Fixed a bug (#191) - :doc:`Loader Library <libraries/loader>` ignored attempts for (re)loading databases to ``get_instance()->db`` even when the old database connection is dead.
+-  Fixed a bug (#1255) - :doc:`User Agent Library <libraries/user_agent>` method ``is_referral()`` only checked if ``$_SERVER['HTTP_REFERER']`` exists.
 
 Version 2.1.3
 =============