diff --git a/system/libraries/User_agent.php b/system/libraries/User_agent.php
index 50ac9be..e13bf85 100644
--- a/system/libraries/User_agent.php
+++ b/system/libraries/User_agent.php
@@ -282,7 +282,7 @@
 		{
 			foreach ($this->browsers as $key => $val)
 			{
-				if (preg_match('|'.preg_quote($key).'.*?([0-9\.]+)|i', $this->agent, $match))
+				if (preg_match('|'.$key.'.*?([0-9\.]+)|i', $this->agent, $match))
 				{
 					$this->is_browser = TRUE;
 					$this->version = $match[1];