diff --git a/system/database/drivers/sqlsrv/sqlsrv_forge.php b/system/database/drivers/sqlsrv/sqlsrv_forge.php
index c817c2c..1529b2a 100644
--- a/system/database/drivers/sqlsrv/sqlsrv_forge.php
+++ b/system/database/drivers/sqlsrv/sqlsrv_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);
 		}