diff --git a/constants.asm b/constants.asm
index cfa27c28e..f77f6c4ec 100644
--- a/constants.asm
+++ b/constants.asm
@@ -2337,6 +2337,7 @@ EVOLVE_HAPPINESS EQU 4
 EVOLVE_STAT      EQU 5
 
 ; happiness evolution triggers
+HAPPINESS_TO_EVOLVE EQU 220
 TR_ANYTIME EQU 1
 TR_MORNDAY EQU 2
 TR_NITE    EQU 3