diff --git a/SimpleCrud/Entity.php b/SimpleCrud/Entity.php
index 0a8cbb6..45e118c 100644
--- a/SimpleCrud/Entity.php
+++ b/SimpleCrud/Entity.php
@@ -533,10 +533,11 @@ private function filterDataToSave (array $data, array $prepared, array $changedF
 	 * @return array The new values of the inserted row
 	 */
 	public function insert (array $data, $duplicateKey = false, array $changedFields = null) {
+		$originalData = $data;
 		$preparedData = $this->prepareDataToDatabase($data, true);
 
 		if ($changedFields !== null) {
-			$preparedData = $this->filterDataToSave($data, $preparedData, $changedFields);
+			$preparedData = $this->filterDataToSave($originalData, $preparedData, $changedFields);
 		}
 
 		unset($preparedData['id']);
@@ -586,10 +587,11 @@ public function insert (array $data, $duplicateKey = false, array $changedFields
 	 * @return array The new values of the updated row
 	 */
 	public function update (array $data, $where = '', $marks = null, $limit = null, array $changedFields = null) {
+		$originalData = $data;
 		$preparedData = $this->prepareDataToDatabase($data, true);
 
 		if ($changedFields !== null) {
-			$preparedData = $this->filterDataToSave($data, $preparedData, $changedFields);
+			$preparedData = $this->filterDataToSave($originalData, $preparedData, $changedFields);
 		}
 
 		unset($preparedData['id']);
diff --git a/tests/SimpleCrudTest.php b/tests/SimpleCrudTest.php
index 1637a2c..21cc85c 100644
--- a/tests/SimpleCrudTest.php
+++ b/tests/SimpleCrudTest.php
@@ -190,6 +190,20 @@ public function testRelations () {
 		$this->assertEquals(['1', '2'], $tags->id);
 	}
 
+	public function testDataToDatabase () {
+		$db = self::$db;
+
+		$row = $db->testing->create(['field1' => 'hello'])->save();
+		$this->assertSame($row->field1, $row->field2);
+
+
+		$row->reload();
+		$this->assertSame($row->field1, $row->field2);
+
+		$row->set(['field1' => 'bye'])->save();
+		$this->assertSame($row->field1, $row->field2);
+	}
+
 	public function testDatetimeFields () {
 		$db = self::$db;
 
diff --git a/tests/db.sql b/tests/db.sql
index f020aaa..179602a 100644
--- a/tests/db.sql
+++ b/tests/db.sql
@@ -65,6 +65,13 @@ CREATE TABLE `customfield` (
   PRIMARY KEY (`id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
+CREATE TABLE `testing` (
+  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
+  `field1` varchar(255) DEFAULT NULL,
+  `field2` varchar(255) DEFAULT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+
 --
 -- Restricións para os envorcados das táboas
 --
diff --git a/tests/entities.php b/tests/entities.php
index 5c32e29..2b44723 100644
--- a/tests/entities.php
+++ b/tests/entities.php
@@ -6,6 +6,14 @@ class CustomField extends \SimpleCrud\Entity {
 			'field' => 'json'
 		];
 	}
+
+	class Testing extends \SimpleCrud\Entity {
+		public function dataToDatabase (array $data, $new) {
+			$data['field2'] = $data['field1'];
+
+			return $data;
+		}
+	}
 }
 
 namespace CustomEntities\Fields {