diff --git a/src/battle_main.c b/src/battle_main.c
index 526c54d62f..e164976e9d 100644
--- a/src/battle_main.c
+++ b/src/battle_main.c
@@ -4717,7 +4717,6 @@ void SwapTurnOrder(u8 id1, u8 id2)
 u32 GetBattlerTotalSpeedStatArgs(u32 battler, u32 ability, u32 holdEffect)
 {
     u32 speed = gBattleMons[battler].speed;
-    u32 highestStat = GetHighestStatId(battler);
 
     // weather abilities
     if (WEATHER_HAS_EFFECT)
@@ -4739,10 +4738,10 @@ u32 GetBattlerTotalSpeedStatArgs(u32 battler, u32 ability, u32 holdEffect)
         speed *= 2;
     else if (ability == ABILITY_SLOW_START && gDisableStructs[battler].slowStartTimer != 0)
         speed /= 2;
-    else if (ability == ABILITY_PROTOSYNTHESIS && gBattleWeather & B_WEATHER_SUN && highestStat == STAT_SPEED)
-        speed = (speed * 150) / 100;
-    else if (ability == ABILITY_QUARK_DRIVE && gFieldStatuses & STATUS_FIELD_ELECTRIC_TERRAIN && highestStat == STAT_SPEED)
-        speed = (speed * 150) / 100;
+    else if (ability == ABILITY_PROTOSYNTHESIS && (gBattleWeather & B_WEATHER_SUN || gBattleStruct->boosterEnergyActivates & gBitTable[battler]))
+        speed = (GetHighestStatId(battler) == STAT_SPEED) ? (speed * 150) / 100 : speed;
+    else if (ability == ABILITY_QUARK_DRIVE && (gFieldStatuses & STATUS_FIELD_ELECTRIC_TERRAIN || gBattleStruct->boosterEnergyActivates & gBitTable[battler]))
+        speed = (GetHighestStatId(battler) == STAT_SPEED) ? (speed * 150) / 100 : speed;
 
     // stat stages
     speed *= gStatStageRatios[gBattleMons[battler].statStages[STAT_SPEED]][0];