diff --git a/lib/Cake/Model/Datasource/Database/Postgres.php b/lib/Cake/Model/Datasource/Database/Postgres.php
index aa55b7662..a9225349d 100644
--- a/lib/Cake/Model/Datasource/Database/Postgres.php
+++ b/lib/Cake/Model/Datasource/Database/Postgres.php
@@ -261,6 +261,9 @@ class Postgres extends DboSource {
 						$this->_sequenceMap[$table][$c->name] = $sequenceName;
 					}
 				}
+				if ($fields[$c->name]['type'] === 'timestamp' && $fields[$c->name]['default'] === '') {
+					$fields[$c->name]['default'] = null;
+				}
 				if ($fields[$c->name]['type'] === 'boolean' && !empty($fields[$c->name]['default'])) {
 					$fields[$c->name]['default'] = constant($fields[$c->name]['default']);
 				}
diff --git a/lib/Cake/Test/Case/Model/Datasource/Database/PostgresTest.php b/lib/Cake/Test/Case/Model/Datasource/Database/PostgresTest.php
index 2cbca6eb5..0c4de769e 100644
--- a/lib/Cake/Test/Case/Model/Datasource/Database/PostgresTest.php
+++ b/lib/Cake/Test/Case/Model/Datasource/Database/PostgresTest.php
@@ -162,8 +162,8 @@ class PostgresClientTestModel extends Model {
 			'id' => array('type' => 'integer', 'null' => '', 'default' => '', 'length' => '8', 'key' => 'primary'),
 			'name' => array('type' => 'string', 'null' => '', 'default' => '', 'length' => '255'),
 			'email' => array('type' => 'string', 'null' => '1', 'default' => '', 'length' => '155'),
-			'created' => array('type' => 'datetime', 'null' => '1', 'default' => '', 'length' => ''),
-			'updated' => array('type' => 'datetime', 'null' => '1', 'default' => '', 'length' => null)
+			'created' => array('type' => 'datetime', 'null' => true, 'default' => null, 'length' => ''),
+			'updated' => array('type' => 'datetime', 'null' => true, 'default' => null, 'length' => null)
 		);
 	}
 
@@ -551,6 +551,7 @@ class PostgresTest extends CakeTestCase {
 			'connection' => 'test',
 			'models' => array('DatatypeTest')
 		));
+
 		$schema->tables = array(
 			'datatype_tests' => $result['tables']['missing']['datatype_tests']
 		);
@@ -1098,4 +1099,49 @@ class PostgresTest extends CakeTestCase {
 		$this->assertNotContains($scientificNotation, $result);
 	}
 
+/**
+ * Test describe() behavior for timestamp columns.
+ *
+ * @return void
+ */
+	public function testDescribeTimestamp() {
+		$this->loadFixtures('User');
+		$model = ClassRegistry::init('User');
+		$result = $this->Dbo->describe($model);
+		$expected = array(
+			'id' => array(
+				'type' => 'integer',
+				'null' => false,
+				'default' => null,
+				'length' => 11,
+				'key' => 'primary'
+			),
+			'user' => array(
+				'type' => 'string',
+				'null' => true,
+				'default' => null,
+				'length' => 255
+			),
+			'password' => array(
+				'type' => 'string',
+				'null' => true,
+				'default' => null,
+				'length' => 255
+			),
+			'created' => array(
+				'type' => 'datetime',
+				'null' => true,
+				'default' => null,
+				'length' => null
+			),
+			'updated' => array(
+				'type' => 'datetime',
+				'null' => true,
+				'default' => null,
+				'length' => null
+			)
+		);
+		$this->assertEquals($expected, $result);
+	}
+
 }