diff --git a/core/views/common_views.py b/core/views/common_views.py
index 26d28d4fcaec9f1d411bc58869a3f4dbefd87366..fa33a262f68defa210a26cf510ac9fe3a894b67e 100644
--- a/core/views/common_views.py
+++ b/core/views/common_views.py
@@ -31,8 +31,7 @@ from core.serializers import (ExamSerializer, StudentInfoSerializer,
                               SubmissionNoTypeSerializer, StudentSubmissionSerializer,
                               SubmissionTypeSerializer, CorrectorSerializer,
                               UserAccountSerializer, SolutionCommentSerializer,
-                              SubmissionNoTypeWithStudentSerializer,
-                              GroupSerializer)
+                              SubmissionNoTypeWithStudentSerializer)
 
 log = logging.getLogger(__name__)
 config = constance.config