diff --git a/system/libraries/Input.php b/system/libraries/Input.php
index fae188e..e66d481 100644
--- a/system/libraries/Input.php
+++ b/system/libraries/Input.php
@@ -404,7 +404,7 @@
 			return FALSE;
 		}
 		// IP can not start with 0
-		if (substr($ip_segments[0], 0, 1) == '0')
+		if ($ip_segments[0][0] == '0')
 		{
 			return FALSE;
 		}