diff --git a/src/battle_util.c b/src/battle_util.c
index 52d24f7a6..5594ecf5a 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -8323,7 +8323,7 @@ static u32 CalcMoveBasePowerAfterModifiers(u16 move, u8 battlerAtk, u8 battlerDe
         MulModifier(&modifier, (B_TERRAIN_TYPE_BOOST >= GEN_8) ? UQ_4_12(1.3) : UQ_4_12(1.5));
     if ((gFieldStatuses & STATUS_FIELD_MUDSPORT && moveType == TYPE_ELECTRIC)
      || (gFieldStatuses & STATUS_FIELD_WATERSPORT && moveType == TYPE_FIRE))
-        MulModifier(&modifier, (B_SPORT_DMG_REDUCTION >= GEN_5) ? UQ_4_12(0.67) : UQ_4_12(0.5));
+        MulModifier(&modifier, (B_SPORT_DMG_REDUCTION >= GEN_5) ? UQ_4_12(0.23) : UQ_4_12(0.5));
 
     return ApplyModifier(modifier, basePower);
 }