diff --git a/greenmine/base/filters.py b/greenmine/base/filters.py
index f586459f..5675338f 100644
--- a/greenmine/base/filters.py
+++ b/greenmine/base/filters.py
@@ -2,8 +2,7 @@
 
 from rest_framework import filters
 
-
-class SimpleFilterBackend(filters.BaseFilterBackend):
+class QueryParamsFilterMixin(object):
     _special_values_dict = {
         'true': True,
         'false': False,
@@ -30,7 +29,15 @@ class SimpleFilterBackend(filters.BaseFilterBackend):
         return queryset
 
 
-class IsProjectMemberFilterBackend(SimpleFilterBackend):
+class FilterBackend(QueryParamsFilterMixin,
+                    filters.BaseFilterBackend):
+    """
+    Default filter backend.
+    """
+    pass
+
+
+class IsProjectMemberFilterBackend(FilterBackend):
     def filter_queryset(self, request, queryset, view):
         queryset = super(IsProjectMemberFilterBackend, self).filter_queryset(
                                                       request, queryset, view)
diff --git a/greenmine/settings/common.py b/greenmine/settings/common.py
index 1bdec5b2..0db3d659 100644
--- a/greenmine/settings/common.py
+++ b/greenmine/settings/common.py
@@ -294,7 +294,7 @@ REST_FRAMEWORK = {
     'DEFAULT_AUTHENTICATION_CLASSES': (
         'greenmine.base.users.auth.SessionAuthentication',
     ),
-    'FILTER_BACKEND': 'greenmine.base.filters.SimpleFilterBackend',
+    'FILTER_BACKEND': 'greenmine.base.filters.FilterBackend',
 }
 
 from .appdefaults import *