diff --git a/CHANGELOG.md b/CHANGELOG.md
index 725db0b217..7b17c7081e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Main branch (git)
 
+- Bug fix: Building Menu contrib menu no using Replace over Union mergetype to
+  avoid clashing with in-game commands while building
 - Feature: RPSystem contrib `sdesc` command can now view/delete your sdesc.
 - Bug fix: Change so `script obj = [scriptname|id]` is required to manipulate scripts
   on objects; `script scriptname|id` only works on global scripts.
diff --git a/docs/source/Coding/Changelog.md b/docs/source/Coding/Changelog.md
index 78be809d15..725db0b217 100644
--- a/docs/source/Coding/Changelog.md
+++ b/docs/source/Coding/Changelog.md
@@ -2,6 +2,7 @@
 
 ## Main branch (git)
 
+- Feature: RPSystem contrib `sdesc` command can now view/delete your sdesc.
 - Bug fix: Change so `script obj = [scriptname|id]` is required to manipulate scripts
   on objects; `script scriptname|id` only works on global scripts.
 - Doc: Add warning about `Django-wiki` (in wiki tutorial) only supporting Django <4.0.
diff --git a/evennia/contrib/base_systems/building_menu/building_menu.py b/evennia/contrib/base_systems/building_menu/building_menu.py
index b1bfdfff0b..518ae14f66 100644
--- a/evennia/contrib/base_systems/building_menu/building_menu.py
+++ b/evennia/contrib/base_systems/building_menu/building_menu.py
@@ -126,7 +126,6 @@ from inspect import getfullargspec
 from textwrap import dedent
 
 from django.conf import settings
-
 from evennia import CmdSet, Command
 from evennia.commands import cmdhandler
 from evennia.utils.ansi import strip_ansi
@@ -399,6 +398,7 @@ class BuildingMenuCmdSet(CmdSet):
 
     key = "building_menu"
     priority = 5
+    mergetype = "Replace"
 
     def at_cmdset_creation(self):
         """Populates the cmdset with commands."""