diff --git a/system/database/drivers/oci8/oci8_driver.php b/system/database/drivers/oci8/oci8_driver.php
index 9d91932..98c9932 100644
--- a/system/database/drivers/oci8/oci8_driver.php
+++ b/system/database/drivers/oci8/oci8_driver.php
@@ -366,7 +366,7 @@
 	 */
 	function escape_str($str)
 	{
-		return $this->input->_remove_invisible_characters($str);
+		return $this->input->CI->_remove_invisible_characters($str);
 	}
 
 	// --------------------------------------------------------------------