diff --git a/system/database/drivers/mssql/mssql_driver.php b/system/database/drivers/mssql/mssql_driver.php
index 342ff26..5bd6669 100644
--- a/system/database/drivers/mssql/mssql_driver.php
+++ b/system/database/drivers/mssql/mssql_driver.php
@@ -64,7 +64,7 @@
 	 */
 	public function db_connect()
 	{
-		if ($this->port != '')
+		if ($this->port !== '')
 		{
 			$this->hostname .= ','.$this->port;
 		}
@@ -81,7 +81,7 @@
 	 */
 	public function db_pconnect()
 	{
-		if ($this->port != '')
+		if ($this->port !== '')
 		{
 			$this->hostname .= ','.$this->port;
 		}
@@ -316,7 +316,7 @@
 		$sql = "SELECT name FROM sysobjects WHERE type = 'U' ORDER BY name";
 
 		// for future compatibility
-		if ($prefix_limit !== FALSE AND $this->dbprefix != '')
+		if ($prefix_limit !== FALSE AND $this->dbprefix !== '')
 		{
 			//$sql .= " LIKE '".$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr);
 			return FALSE; // not currently supported
diff --git a/system/database/drivers/mssql/mssql_forge.php b/system/database/drivers/mssql/mssql_forge.php
index bbf2d96..3708c22 100644
--- a/system/database/drivers/mssql/mssql_forge.php
+++ b/system/database/drivers/mssql/mssql_forge.php
@@ -155,21 +155,21 @@
 		$sql = 'ALTER TABLE '.$this->db->protect_identifiers($table).' '.$alter_type.' '.$this->db->protect_identifiers($column_name);
 
 		// DROP has everything it needs now.
-		if ($alter_type == 'DROP')
+		if ($alter_type === 'DROP')
 		{
 			return $sql;
 		}
 
 		$sql .= " ".$column_definition;
 
-		if ($default_value != '')
+		if ($default_value !== '')
 		{
 			$sql .= " DEFAULT '".$default_value."'";
 		}
 
 		$sql .= ($null === NULL) ? ' NULL' : ' NOT NULL';
 
-		if ($after_field != '')
+		if ($after_field !== '')
 		{
 			return $sql.' AFTER '.$this->db->protect_identifiers($after_field);
 		}