diff --git a/extensions/redis/ActiveRecord.php b/extensions/redis/ActiveRecord.php
index 1c6b70a..37421cd 100644
--- a/extensions/redis/ActiveRecord.php
+++ b/extensions/redis/ActiveRecord.php
@@ -9,6 +9,7 @@ namespace yii\redis;
 
 use yii\base\InvalidConfigException;
 use yii\base\NotSupportedException;
+use yii\db\BaseActiveRecord;
 use yii\helpers\StringHelper;
 
 /**
@@ -34,7 +35,7 @@ use yii\helpers\StringHelper;
  * @author Carsten Brandt <mail@cebe.cc>
  * @since 2.0
  */
-class ActiveRecord extends \yii\db\ActiveRecord
+class ActiveRecord extends BaseActiveRecord
 {
 	/**
 	 * Returns the database connection used by this AR class.
diff --git a/framework/yii/db/ActiveRelationTrait.php b/framework/yii/db/ActiveRelationTrait.php
index 2960196..832bb62 100644
--- a/framework/yii/db/ActiveRelationTrait.php
+++ b/framework/yii/db/ActiveRelationTrait.php
@@ -104,7 +104,7 @@ trait ActiveRelationTrait
 		if (count($primaryModels) === 1 && !$this->multiple) {
 			$model = $this->one();
 			foreach ($primaryModels as $i => $primaryModel) {
-				if ($primaryModel instanceof ActiveRecord) {
+				if ($primaryModel instanceof ActiveRecordInterface) {
 					$primaryModel->populateRelation($name, $model);
 				} else {
 					$primaryModels[$i][$name] = $model;
@@ -123,7 +123,7 @@ trait ActiveRelationTrait
 			foreach ($primaryModels as $i => $primaryModel) {
 				$key = $this->getModelKey($primaryModel, $link);
 				$value = isset($buckets[$key]) ? $buckets[$key] : ($this->multiple ? [] : null);
-				if ($primaryModel instanceof ActiveRecord) {
+				if ($primaryModel instanceof ActiveRecordInterface) {
 					$primaryModel->populateRelation($name, $value);
 				} else {
 					$primaryModels[$i][$name] = $value;
diff --git a/framework/yii/test/DbFixtureManager.php b/framework/yii/test/DbFixtureManager.php
index ed90284..23d25d4 100644
--- a/framework/yii/test/DbFixtureManager.php
+++ b/framework/yii/test/DbFixtureManager.php
@@ -11,6 +11,7 @@ use Yii;
 use yii\base\Component;
 use yii\base\InvalidConfigException;
 use yii\db\ActiveRecord;
+use yii\db\ActiveRecordInterface;
 use yii\db\Connection;
 
 /**
@@ -92,7 +93,7 @@ class DbFixtureManager extends Component
 		foreach ($fixtures as $name => $fixture) {
 			if (strpos($fixture, '\\') !== false) {
 				$model = new $fixture;
-				if ($model instanceof ActiveRecord) {
+				if ($model instanceof ActiveRecordInterface) {
 					$this->_modelClasses[$name] = $fixture;
 					$fixtures[$name] = $model->getTableSchema()->name;
 				} else {
diff --git a/framework/yii/validators/UniqueValidator.php b/framework/yii/validators/UniqueValidator.php
index 053f795..d123aad 100644
--- a/framework/yii/validators/UniqueValidator.php
+++ b/framework/yii/validators/UniqueValidator.php
@@ -10,6 +10,7 @@ namespace yii\validators;
 use Yii;
 use yii\base\InvalidConfigException;
 use yii\db\ActiveRecord;
+use yii\db\ActiveRecordInterface;
 
 /**
  * UniqueValidator validates that the attribute value is unique in the corresponding database table.
@@ -67,7 +68,7 @@ class UniqueValidator extends Validator
 		$query = $className::find();
 		$query->where([$attributeName => $value]);
 
-		if (!$object instanceof ActiveRecord || $object->getIsNewRecord()) {
+		if (!$object instanceof ActiveRecordInterface || $object->getIsNewRecord()) {
 			// if current $object isn't in the database yet then it's OK just to call exists()
 			$exists = $query->exists();
 		} else {