diff --git a/lib/Db/OptionMapper.php b/lib/Db/OptionMapper.php
index 91029ad..959c5ab 100644
--- a/lib/Db/OptionMapper.php
+++ b/lib/Db/OptionMapper.php
@@ -26,8 +26,9 @@ declare(strict_types=1);
 
 namespace OCA\Forms\Db;
 
-use OCP\IDBConnection;
+use OCP\AppFramework\Db\DoesNotExistException;
 use OCP\AppFramework\Db\QBMapper;
+use OCP\IDBConnection;
 
 class OptionMapper extends QBMapper {
 
@@ -41,7 +42,7 @@ class OptionMapper extends QBMapper {
 
 	/**
 	 * @param int $questionId
-	 * @throws \OCP\AppFramework\Db\DoesNotExistException if not found
+	 * @throws DoesNotExistException if not found
 	 * @return Option[]
 	 */
 
diff --git a/lib/Db/QuestionMapper.php b/lib/Db/QuestionMapper.php
index cb0efe4..9ac6651 100644
--- a/lib/Db/QuestionMapper.php
+++ b/lib/Db/QuestionMapper.php
@@ -26,9 +26,10 @@
 
 namespace OCA\Forms\Db;
 
+use OCP\AppFramework\Db\QBMapper;
 use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\IDBConnection;
-use OCP\AppFramework\Db\QBMapper;
+use OCP\AppFramework\Db\DoesNotExistException;
 
 class QuestionMapper extends QBMapper {
 	private $optionMapper;
@@ -41,7 +42,7 @@ class QuestionMapper extends QBMapper {
 
 	/**
 	 * @param int $formId
-	 * @throws \OCP\AppFramework\Db\DoesNotExistException if not found
+	 * @throws DoesNotExistException if not found
 	 * @return Question[]
 	 */
 
diff --git a/lib/Db/SubmissionMapper.php b/lib/Db/SubmissionMapper.php
index 94a496a..d89d113 100644
--- a/lib/Db/SubmissionMapper.php
+++ b/lib/Db/SubmissionMapper.php
@@ -25,9 +25,10 @@
 
 namespace OCA\Forms\Db;
 
+use OCP\AppFramework\Db\DoesNotExistException;
+use OCP\AppFramework\Db\QBMapper;
 use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\IDBConnection;
-use OCP\AppFramework\Db\QBMapper;
 
 class SubmissionMapper extends QBMapper {
 	private $answerMapper;
@@ -45,7 +46,7 @@ class SubmissionMapper extends QBMapper {
 
 	/**
 	 * @param int $formId
-	 * @throws \OCP\AppFramework\Db\DoesNotExistException if not found
+	 * @throws DoesNotExistException if not found
 	 * @return Submission[]
 	 */
 	public function findByForm(int $formId): array {
@@ -62,7 +63,7 @@ class SubmissionMapper extends QBMapper {
 
 	/**
 	 * @param int $formId
-	 * @throws \OCP\AppFramework\Db\DoesNotExistException if not found
+	 * @throws DoesNotExistException if not found
 	 * @return array
 	 */
 	public function findParticipantsByForm(int $formId): array {