diff --git a/programs/demos/mos3de/mos3de.asm b/programs/demos/mos3de/mos3de.asm
index 567d2b26c5..78b88a90fb 100644
--- a/programs/demos/mos3de/mos3de.asm
+++ b/programs/demos/mos3de/mos3de.asm
@@ -1563,7 +1563,7 @@ ret
 ; The Quads should not intersect for a bearable z-sorting. The Quads must be
 ; clockwise.
    
-include "CUBE.INC"
+include "cube.inc"
    
 ;;------------------------------