diff --git a/openedx/core/djangoapps/xblock/runtime/runtime.py b/openedx/core/djangoapps/xblock/runtime/runtime.py
index fd133a9a026..781ca58cb2d 100644
--- a/openedx/core/djangoapps/xblock/runtime/runtime.py
+++ b/openedx/core/djangoapps/xblock/runtime/runtime.py
@@ -26,6 +26,7 @@
 from xmodule.errortracker import make_error_tracker
 from xmodule.contentstore.django import contentstore
 from xmodule.modulestore.django import XBlockI18nService
+from xmodule.modulestore.inheritance import InheritanceMixin
 from xmodule.services import EventPublishingService, RebindUserService, ProblemFeedbackService
 from xmodule.util.sandboxing import SandboxService
 from common.djangoapps.edxmako.services import MakoService
@@ -101,6 +102,7 @@ def __init__(self, system: XBlockRuntimeSystem, user: UserType | None):
             mixins=(
                 LmsBlockMixin,  # Adds Non-deprecated LMS/Studio functionality
                 XBlockShim,  # Adds deprecated LMS/Studio functionality / backwards compatibility
+                InheritanceMixin,
             ),
             default_class=None,
             select=None,