diff --git a/CorsixTH/Lua/app.lua b/CorsixTH/Lua/app.lua
index bef9ba5..dedc20f 100644
--- a/CorsixTH/Lua/app.lua
+++ b/CorsixTH/Lua/app.lua
@@ -235,6 +235,7 @@ function App:init()
   -- Load additional Lua before world
   if good_install_folder then
     self.anims = self.gfx:loadAnimations("Data", "V")
+    print(self.anims.Alt32_GreyScale)
     self.animation_manager = AnimationManager(self.anims)
     self.walls = self:loadLuaFolder"walls"
     dofile "entity"
diff --git a/CorsixTH/Src/th_lua_anims.cpp b/CorsixTH/Src/th_lua_anims.cpp
index e38694a..5ceb8d0 100644
--- a/CorsixTH/Src/th_lua_anims.cpp
+++ b/CorsixTH/Src/th_lua_anims.cpp
@@ -658,6 +658,7 @@ void THLuaRegisterAnims(const THLuaRegisterState_t *pState)
     luaT_setfunction(l_anims_set_marker, "setFrameMarker");
     luaT_setfunction(l_anims_set_secondary_marker, "setFrameSecondaryMarker");
     luaT_setfunction(l_anims_draw, "draw", MT_Surface, MT_Layers);
+    luaT_setvalue("Alt32_GreyScale", THDF_Alt32_GreyScale);
     luaT_endclass();
 
     // Weak table at AnimMetatable[1] for light UD -> object lookup
diff --git a/CorsixTH/Src/th_lua_internal.h b/CorsixTH/Src/th_lua_internal.h
index c0794a1..7f09773 100644
--- a/CorsixTH/Src/th_lua_internal.h
+++ b/CorsixTH/Src/th_lua_internal.h
@@ -118,4 +118,8 @@ void luaT_setclosure(const THLuaRegisterState_t *pState, lua_CFunction fn,
     luaT_setclosure(pState, fn, ## __VA_ARGS__, MT_Count); \
     lua_setfield(pState->L, -2, name)
 
+#define luaT_setvalue(name, value) \
+    luaT_push(pState->L, value); \
+    lua_setfield(pState->L, -2, name)
+
 #endif