diff --git a/awx/api/views.py b/awx/api/views.py
index efa66ef828..c628fd89f2 100644
--- a/awx/api/views.py
+++ b/awx/api/views.py
@@ -1437,7 +1437,7 @@ class GroupAllHostsList(SubListAPIView):
     def get_queryset(self):
         parent = self.get_parent_object()
         self.check_parent_access(parent)
-        qs = self.request.user.get_queryset(self.model)
+        qs = self.request.user.get_queryset(self.model).distinct() # need distinct for '&' operator
         sublist_qs = parent.all_hosts.distinct()
         return qs & sublist_qs