diff --git a/framework/yii/db/cubrid/QueryBuilder.php b/framework/yii/db/cubrid/QueryBuilder.php
index 4e5121a..935b3d3 100644
--- a/framework/yii/db/cubrid/QueryBuilder.php
+++ b/framework/yii/db/cubrid/QueryBuilder.php
@@ -34,7 +34,7 @@ class QueryBuilder extends \yii\db\QueryBuilder
 		Schema::TYPE_TIME => 'time',
 		Schema::TYPE_DATE => 'date',
 		Schema::TYPE_BINARY => 'blob',
-		Schema::TYPE_BOOLEAN => 'bit(1)',
+		Schema::TYPE_BOOLEAN => 'smallint',
 		Schema::TYPE_MONEY => 'decimal(19,4)',
 	);
 
diff --git a/framework/yii/db/cubrid/Schema.php b/framework/yii/db/cubrid/Schema.php
index a423296..c07602f 100644
--- a/framework/yii/db/cubrid/Schema.php
+++ b/framework/yii/db/cubrid/Schema.php
@@ -198,15 +198,6 @@ class Schema extends \yii\db\Schema
 					if (isset($values[1])) {
 						$column->scale = (int)$values[1];
 					}
-					if ($type === 'bit' || $type === 'bit varying') {
-						if ($column->size === 1) {
-							$column->type = self::TYPE_BOOLEAN;
-						} elseif ($column->size > 32) {
-							$column->type = self::TYPE_BIGINT;
-						} elseif ($column->size === 32) {
-							$column->type = self::TYPE_INTEGER;
-						}
-					}
 				}
 			}
 		}
@@ -253,7 +244,7 @@ class Schema extends \yii\db\Schema
 	public function getPdoType($data)
 	{
 		static $typeMap = array(
-			'boolean' => \PDO::PARAM_STR, // CUBRID PDO does not support PARAM_BOOL
+			'boolean' => \PDO::PARAM_INT, // CUBRID PDO does not support PARAM_BOOL
 			'integer' => \PDO::PARAM_INT,
 			'string' => \PDO::PARAM_STR,
 			'resource' => \PDO::PARAM_LOB,
diff --git a/tests/unit/data/cubrid.sql b/tests/unit/data/cubrid.sql
index 2cf7716..5525418 100644
--- a/tests/unit/data/cubrid.sql
+++ b/tests/unit/data/cubrid.sql
@@ -71,8 +71,8 @@ CREATE TABLE `tbl_type` (
   `blob_col` blob,
   `numeric_col` decimal(5,2) DEFAULT '33.22',
   `time` timestamp NOT NULL DEFAULT '2002-01-01 00:00:00',
-  `bool_col` bit(1) NOT NULL,
-  `bool_col2` bit(1) DEFAULT B'1'
+  `bool_col` smallint NOT NULL,
+  `bool_col2` smallint DEFAULT 1
 );
 
 INSERT INTO tbl_customer (email, name, address, status) VALUES ('user1@example.com', 'user1', 'address1', 1);
diff --git a/tests/unit/framework/db/cubrid/CubridQueryBuilderTest.php b/tests/unit/framework/db/cubrid/CubridQueryBuilderTest.php
index 36967d7..94a002e 100644
--- a/tests/unit/framework/db/cubrid/CubridQueryBuilderTest.php
+++ b/tests/unit/framework/db/cubrid/CubridQueryBuilderTest.php
@@ -67,8 +67,8 @@ class CubridQueryBuilderTest extends QueryBuilderTest
 			array(Schema::TYPE_DATE . " CHECK(value BETWEEN '2011-01-01' AND '2013-01-01')", "date CHECK(value BETWEEN '2011-01-01' AND '2013-01-01')"),
 			array(Schema::TYPE_DATE . ' NOT NULL', 'date NOT NULL'),
 			array(Schema::TYPE_BINARY, 'blob'),
-			array(Schema::TYPE_BOOLEAN, 'bit(1)'),
-			array(Schema::TYPE_BOOLEAN . ' NOT NULL DEFAULT 1', 'bit(1) NOT NULL DEFAULT 1'),
+			array(Schema::TYPE_BOOLEAN, 'smallint'),
+			array(Schema::TYPE_BOOLEAN . ' NOT NULL DEFAULT 1', 'smallint NOT NULL DEFAULT 1'),
 			array(Schema::TYPE_MONEY, 'decimal(19,4)'),
 			array(Schema::TYPE_MONEY . '(16,2)', 'decimal(16,2)'),
 			array(Schema::TYPE_MONEY . ' CHECK (value > 0.0)', 'decimal(19,4) CHECK (value > 0.0)'),