diff --git a/src/maploader/udmf.cpp b/src/maploader/udmf.cpp
index b579c0469..f70b6f2eb 100644
--- a/src/maploader/udmf.cpp
+++ b/src/maploader/udmf.cpp
@@ -762,6 +762,9 @@ public:
 			case NAME_sundirx:
 			case NAME_sundiry:
 			case NAME_sundirz:
+			case NAME_sampledistance:
+			case NAME_bounces:
+			case NAME_gridsize:
 				CHECK_N(Zd | Zdt)
 				break;