diff --git a/atlas/filters.py b/atlas/filters.py
index cd59a77d..030f6795 100755
--- a/atlas/filters.py
+++ b/atlas/filters.py
@@ -22,7 +22,7 @@ class CaseFilter(django_filters.FilterSet):
     )
     foo = django_filters.filters.ModelMultipleChoiceFilter(
         field_name='differential__condition',
-        to_field_name='Diff',
+        to_field_name='differential',
         queryset=Condition.objects.all(),
     )