diff --git a/src/battle_script_commands.c b/src/battle_script_commands.c
index 7c009e0775..09535e0794 100644
--- a/src/battle_script_commands.c
+++ b/src/battle_script_commands.c
@@ -8520,7 +8520,7 @@ static void Cmd_friendshiptodamagecalculation(void)
     if (gBattleMoves[gCurrentMove].effect == EFFECT_RETURN)
         gDynamicBasePower = 10 * (gBattleMons[gBattlerAttacker].friendship) / 25;
     else // EFFECT_FRUSTRATION
-        gDynamicBasePower = 10 * (255 - gBattleMons[gBattlerAttacker].friendship) / 25;
+        gDynamicBasePower = 10 * (MAX_FRIENDSHIP - gBattleMons[gBattlerAttacker].friendship) / 25;
 
     gBattlescriptCurrInstr++;
 }