diff --git a/tests/test_formdata.py b/tests/test_formdata.py
index c141d68f8..c75a94368 100644
--- a/tests/test_formdata.py
+++ b/tests/test_formdata.py
@@ -935,24 +935,34 @@ def test_lazy_formdata_queryset_distance(pub, variable_test_data):
 
 
 def test_lazy_formdata_queryset_filter(pub, variable_test_data):
+    wf = Workflow.get_default_workflow()
+    wf.id = None
+    wf.backoffice_fields_formdef = WorkflowBackofficeFieldsFormDef(wf)
+    wf.backoffice_fields_formdef.fields = [
+        fields.StringField(id='bo1', label='1st backoffice field',
+            type='string', varname='backoffice_blah'),
+    ]
+    wf.store()
+
     lazy_formdata = variable_test_data
     formdef = lazy_formdata._formdef
+    formdef.workflow = wf
     formdef.store()
     data_class = lazy_formdata._formdef.data_class()
     for i in range(6):
         formdata = data_class()
-        formdata.data = {'0': 'bar'}
+        formdata.data = {'0': 'bar', 'bo1': 'plop1'}
         formdata.just_created()
         formdata.store()
     for i in range(4):
         formdata = data_class()
-        formdata.data = {'0': 'foo'}
+        formdata.data = {'0': 'foo', 'bo1': 'plop2'}
         formdata.just_created()
         formdata.jump_status('finished')
         formdata.store()
 
     formdata = data_class()
-    formdata.data = {'0': 'bar'}
+    formdata.data = {'0': 'bar', 'bo1': 'plop1'}
     formdata.status = 'draft'
     formdata.store()
 
@@ -969,6 +979,14 @@ def test_lazy_formdata_queryset_filter(pub, variable_test_data):
     queryset = lazy_formdata.objects.filter_by('foo_foo').apply_filter_value('X')
     assert queryset.count == 0
 
+    # filter function on backoffice field
+    queryset = lazy_formdata.objects.filter_by('backoffice_blah').apply_filter_value('plop1')
+    assert queryset.count == 6
+    queryset = lazy_formdata.objects.filter_by('backoffice_blah').apply_filter_value('plop2')
+    assert queryset.count == 4
+    queryset = lazy_formdata.objects.filter_by('backoffice_blah').apply_filter_value('X')
+    assert queryset.count == 0
+
     # filter using attribute name
     queryset = lazy_formdata.objects.filter_by_foo_foo().apply_filter_value('bar')
     assert queryset.count == 7
diff --git a/wcs/variables.py b/wcs/variables.py
index 256d5dac7..abc43a212 100644
--- a/wcs/variables.py
+++ b/wcs/variables.py
@@ -123,7 +123,7 @@ class LazyFormDefObjectsManager(object):
 
     def apply_filter_value(self, value):
         assert self.pending_attr
-        for field in self._formdef.fields:
+        for field in self._formdef.get_all_fields():
             if getattr(field, 'varname', None) == self.pending_attr:
                 from wcs import sql
                 criteria = Equal(sql.get_field_id(field), value)