diff --git a/backend/api/permissions.py b/backend/api/permissions.py
index 985de1ef..ad70faf6 100644
--- a/backend/api/permissions.py
+++ b/backend/api/permissions.py
@@ -1,13 +1,7 @@
 from rest_framework.permissions import BasePermission
 
 
-class ProjectMixin:
-    @classmethod
-    def get_project_id(cls, request, view):
-        return view.kwargs.get('project_id') or request.query_params.get('project_id')
-
-
-class CanEditAnnotation(ProjectMixin, BasePermission):
+class CanEditAnnotation(BasePermission):
 
     def __init__(self, queryset):
         super().__init__()
@@ -21,7 +15,7 @@ class CanEditAnnotation(ProjectMixin, BasePermission):
         return self.queryset.filter(id=annotation_id, user=request.user).exists()
 
 
-class IsOwnComment(ProjectMixin, BasePermission):
+class IsOwnComment(BasePermission):
     @classmethod
     def has_object_permission(cls, request, view, obj):
         if request.user.is_superuser:
diff --git a/backend/roles/permissions.py b/backend/roles/permissions.py
index be3a33cb..31c49717 100644
--- a/backend/roles/permissions.py
+++ b/backend/roles/permissions.py
@@ -2,15 +2,18 @@ from django.conf import settings
 from django.db.models import Subquery
 from rest_framework.permissions import BasePermission, SAFE_METHODS
 
-from api.permissions import ProjectMixin
 from .models import Member, Role
 
 
-class RolePermission(ProjectMixin, BasePermission):
+class RolePermission(BasePermission):
     UNSAFE_METHODS = ('POST', 'PATCH', 'DELETE')
     unsafe_methods_check = True
     role_name = ''
 
+    @classmethod
+    def get_project_id(cls, request, view):
+        return view.kwargs.get('project_id') or request.query_params.get('project_id')
+
     def has_permission(self, request, view):
         if request.user.is_superuser:
             return True