diff --git a/sbas/filters.py b/sbas/filters.py
index 363c7b60..afc5e508 100644
--- a/sbas/filters.py
+++ b/sbas/filters.py
@@ -1,6 +1,6 @@
 import django_filters
 
-from .models import Question, CidUserAnswer, Exam
+from .models import Category, Question, CidUserAnswer, Exam
 
 #from generic.filters import UserAnswerFilter
 from django.contrib.auth.models import User
@@ -32,7 +32,7 @@ def get_authors(request):
 class QuestionFilter(django_filters.FilterSet):
     exams = django_filters.ModelMultipleChoiceFilter(queryset=get_exams, null_label="No exam")
     author = django_filters.ModelMultipleChoiceFilter(queryset=get_authors, null_label="No author")
-    category = django_filters.ModelChoiceFilter(null_label="Uncategorised")
+    category = django_filters.ModelChoiceFilter(queryset=Category.objects.all(),null_label="Uncategorised")
     class Meta:
         model = Question
         fields = ("exams", "created_date")