diff --git a/code/__DEFINES/icon_smoothing.dm b/code/__DEFINES/icon_smoothing.dm
index aceea54b704..993be0c6192 100644
--- a/code/__DEFINES/icon_smoothing.dm
+++ b/code/__DEFINES/icon_smoothing.dm
@@ -125,3 +125,5 @@ DEFINE_BITFIELD(smoothing_flags, list(
 #define SMOOTH_GROUP_CLEANABLE_DIRT	S_OBJ(67)			///obj/effect/decal/cleanable/dirt
 
 #define SMOOTH_GROUP_INDUSTRIAL_LIFT S_OBJ(70)			///obj/structure/industrial_lift
+
+#define MAX_S_OBJ SMOOTH_GROUP_INDUSTRIAL_LIFT //Always match this value with the one above it.