diff --git a/constants.asm b/constants.asm
index 9605dafc5..9cece6daa 100644
--- a/constants.asm
+++ b/constants.asm
@@ -1,5 +1,11 @@
 _CRYSTAL EQU 1
 
+if _CRYSTAL
+VERSION EQU 0
+else
+VERSION EQU 1
+endc
+
 INCLUDE "constants/pokemon_constants.asm"
 INCLUDE "constants/move_constants.asm"
 INCLUDE "constants/battle_constants.asm"