diff --git a/rest_framework/filters.py b/rest_framework/filters.py
index 4d5cc4c13a..8c32997bd8 100644
--- a/rest_framework/filters.py
+++ b/rest_framework/filters.py
@@ -298,7 +298,7 @@ def get_valid_fields(self, queryset, view, context=None):
                 (field.name, field.verbose_name) for field in queryset.model._meta.fields
             ]
             valid_fields += [
-                (key, key.title().split('__'))
+                (key, ' '.join(key.title().split('__')))
                 for key in queryset.query.annotations
             ]
         else:
diff --git a/tests/test_filters.py b/tests/test_filters.py
index 80cb0a481e..9b05e37f13 100644
--- a/tests/test_filters.py
+++ b/tests/test_filters.py
@@ -977,6 +977,20 @@ class OrderingListView(generics.ListAPIView):
 
         self.assertContains(response, 'verbose title')
 
+    def test_get_template_context_annotation_label(self):
+        class OrderingListView(generics.ListAPIView):
+            ordering_fields = '__all__'
+            serializer_class = OrderingFilterSerializer
+            queryset = OrderingFilterModel.objects.all().annotate(
+                models.Count("related"))
+            filter_backends = (filters.OrderingFilter,)
+
+        request = factory.get('/', HTTP_ACCEPT='text/html')
+        view = OrderingListView.as_view()
+        response = view(request)
+
+        self.assertContains(response, 'Related Count - ascending')
+
     def test_ordering_with_overridden_get_serializer_class(self):
         class OrderingListView(generics.ListAPIView):
             queryset = OrderingFilterModel.objects.all()