diff --git a/gitlab/objects.py b/gitlab/objects.py
index fb6200023..c8b6e95fe 100644
--- a/gitlab/objects.py
+++ b/gitlab/objects.py
@@ -2695,7 +2695,7 @@ def __init__(self, *args, **kwargs):
         Project.__init__(self, *args, **kwargs)
 
 
-class GroupProjectManager(BaseManager):
+class GroupProjectManager(ProjectManager):
     obj_cls = GroupProject