diff --git a/Source/Plugins/StairSectorBuilder/BuilderPlug.cs b/Source/Plugins/StairSectorBuilder/BuilderPlug.cs
index 7df700e39d1ac2bdcca68810ee5a206f6f8628c4..e84fde39f63b2a238abe8d9fb74de6596d7111c4 100755
--- a/Source/Plugins/StairSectorBuilder/BuilderPlug.cs
+++ b/Source/Plugins/StairSectorBuilder/BuilderPlug.cs
@@ -164,6 +164,7 @@ namespace CodeImp.DoomBuilder.StairSectorBuilderMode
 				}
 			}
 
+			General.Editing.Mode.UpdateSelectionInfo();
 			General.Interface.RedrawDisplay();
 		}