diff --git a/src/battle_util.c b/src/battle_util.c
index 42c55541c1..d5ef03ffff 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -2970,7 +2970,7 @@ u8 AbilityBattleEffects(u8 caseID, u8 battler, u8 ability, u8 special, u16 moveA
                     effect = 2, statId = STAT_SPATK;
                 break;
             case ABILITY_SAP_SIPPER:
-                if (moveArg == TYPE_GRASS)
+                if (moveType == TYPE_GRASS)
                     effect = 2, statId = STAT_ATK;
                 break;
             case ABILITY_FLASH_FIRE: