diff --git a/system/database/drivers/pdo/pdo_driver.php b/system/database/drivers/pdo/pdo_driver.php
index 923f0e1..d2dfa8b 100644
--- a/system/database/drivers/pdo/pdo_driver.php
+++ b/system/database/drivers/pdo/pdo_driver.php
@@ -387,7 +387,7 @@
 			{
 				if ($field !== $index)
 				{
-					$final[$field][] =  'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
+					$final[$field][] = 'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
 				}
 			}
 		}
diff --git a/system/database/drivers/pdo/subdrivers/pdo_cubrid_driver.php b/system/database/drivers/pdo/subdrivers/pdo_cubrid_driver.php
index c2112d6..7e703e7 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_cubrid_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_cubrid_driver.php
@@ -185,7 +185,7 @@
 			{
 				if ($field !== $index)
 				{
-					$final[$field][] =  'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
+					$final[$field][] = 'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
 				}
 			}
 		}
diff --git a/system/database/drivers/pdo/subdrivers/pdo_ibm_driver.php b/system/database/drivers/pdo/subdrivers/pdo_ibm_driver.php
index 4d84368..2ef97cd 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_ibm_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_ibm_driver.php
@@ -187,7 +187,7 @@
 	 * @param	string	$table
 	 * @param	array	$values
 	 * @return	string
-         */
+	 */
 	protected function _update($table, $values)
 	{
 		$this->qb_limit = FALSE;
diff --git a/system/database/drivers/pdo/subdrivers/pdo_informix_driver.php b/system/database/drivers/pdo/subdrivers/pdo_informix_driver.php
index 1db5205..cfb474e 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_informix_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_informix_driver.php
@@ -237,7 +237,7 @@
 	 * @param	string	$table
 	 * @param	array	$values
 	 * @return	string
-         */
+	 */
 	protected function _update($table, $values)
 	{
 		$this->qb_limit = FALSE;
diff --git a/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php b/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php
index b54765d..a293972 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php
@@ -221,7 +221,7 @@
 			{
 				if ($field !== $index)
 				{
-					$final[$field][] =  'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
+					$final[$field][] = 'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
 				}
 			}
 		}
diff --git a/system/database/drivers/pdo/subdrivers/pdo_odbc_driver.php b/system/database/drivers/pdo/subdrivers/pdo_odbc_driver.php
index 05b34fa..c940a7b 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_odbc_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_odbc_driver.php
@@ -167,7 +167,7 @@
 				.sprintf($this->_like_escape_str, $this->_like_escape_chr);
 		}
 
-                return $sql;
+		return $sql;
 	}
 
 	// --------------------------------------------------------------------
@@ -195,7 +195,7 @@
 	 * @param	string	$table
 	 * @param	array	$values
 	 * @return	string
-         */
+	 */
 	protected function _update($table, $values)
 	{
 		$this->qb_limit = FALSE;
diff --git a/system/database/drivers/pdo/subdrivers/pdo_pgsql_driver.php b/system/database/drivers/pdo/subdrivers/pdo_pgsql_driver.php
index 803cc24..1300772 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_pgsql_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_pgsql_driver.php
@@ -251,7 +251,7 @@
 	 * @param	string	$table
 	 * @param	array	$values
 	 * @return	string
-         */
+	 */
 	protected function _update($table, $values)
 	{
 		$this->qb_limit = FALSE;
@@ -282,7 +282,7 @@
 			{
 				if ($field !== $index)
 				{
-					$final[$field][] =  'WHEN '.$val[$index].' THEN '.$val[$field];
+					$final[$field][] = 'WHEN '.$val[$index].' THEN '.$val[$field];
 				}
 			}
 		}
diff --git a/system/database/drivers/pdo/subdrivers/pdo_sqlite_driver.php b/system/database/drivers/pdo/subdrivers/pdo_sqlite_driver.php
index cd69650..568044e 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_sqlite_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_sqlite_driver.php
@@ -190,7 +190,7 @@
 	 *
 	 * @param	string	$table
 	 * @return	string
-         */
+	 */
 	protected function _truncate($table)
 	{
 		return 'DELETE FROM '.$table;
diff --git a/system/database/drivers/pdo/subdrivers/pdo_sqlsrv_driver.php b/system/database/drivers/pdo/subdrivers/pdo_sqlsrv_driver.php
index b28197c..ec02526 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_sqlsrv_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_sqlsrv_driver.php
@@ -250,7 +250,7 @@
 	 * @param	string	$table
 	 * @param	array	$values
 	 * @return	string
-         */
+	 */
 	protected function _update($table, $values)
 	{
 		$this->qb_limit = FALSE;