diff --git a/src/battle_util.c b/src/battle_util.c
index 75460df9ff..2782e55e0f 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -6157,9 +6157,9 @@ u8 AbilityBattleEffects(u8 caseID, u8 battler, u16 ability, u8 special, u16 move
             }
             break;
         case ABILITY_PROTOSYNTHESIS:
-            if (!gSpecialStatuses[battler].terrainAbilityDone && IsBattlerWeatherAffected(battler, B_WEATHER_SUN))
+            if (!gSpecialStatuses[battler].weatherAbilityDone && IsBattlerWeatherAffected(battler, B_WEATHER_SUN))
             {
-                gSpecialStatuses[battler].terrainAbilityDone = TRUE;
+                gSpecialStatuses[battler].weatherAbilityDone = TRUE;
                 PREPARE_STAT_BUFFER(gBattleTextBuff1, GetHighestStatId(battler));
                 BattleScriptPushCursorAndCallback(BattleScript_ProtosynthesisActivates);
                 effect++;