diff --git a/extras/conf/udb/Includes/SRB222_linedefs.cfg b/extras/conf/udb/Includes/SRB222_linedefs.cfg
index 0b92442e6..88a97e6ed 100644
--- a/extras/conf/udb/Includes/SRB222_linedefs.cfg
+++ b/extras/conf/udb/Includes/SRB222_linedefs.cfg
@@ -2198,6 +2198,7 @@ udmf
 		260
 		{
 			title = "Generalized 3D Floor";
+			prefix = "(260)";
 			id = "Sector_Set3dFloor";
 			requiresactivation = false;