diff --git a/src/battle_util.c b/src/battle_util.c
index 9b6f706bf5..583e0c5676 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -7561,7 +7561,7 @@ static u32 CalcDefenseStat(u16 move, u8 battlerAtk, u8 battlerDef, u8 moveType,
         break;
     case ABILITY_PUNK_ROCK:
         if (gBattleMoves[move].flags & FLAG_SOUND)
-            MulModifier(&modifier, UQ_4_12(1.3));
+            MulModifier(&modifier, UQ_4_12(2.0));
         break;
     }