diff --git a/forge-gui/res/cardsfolder/w/wormfang_crab.txt b/forge-gui/res/cardsfolder/w/wormfang_crab.txt
index 4f0397e7957..6aa67466a7e 100644
--- a/forge-gui/res/cardsfolder/w/wormfang_crab.txt
+++ b/forge-gui/res/cardsfolder/w/wormfang_crab.txt
@@ -4,7 +4,7 @@ Types:Creature Nightmare Crab
 PT:3/6
 K:Unblockable
 T:Mode$ ChangesZone | Origin$ Any | Destination$ Battlefield | ValidCard$ Card.Self | Execute$ TrigChoice | TriggerDescription$ When CARDNAME enters the battlefield, an opponent chooses a permanent you control other than CARDNAME and exiles it.
-SVar:TrigChoice:DB$ ChooseCard | Defined$ Opponent | Amount$ 1 | Choices$ Permanent.YouCtrl+Other | RememberChosen$ True | SubAbility$ ExileChoice
+SVar:TrigChoice:DB$ ChooseCard | Defined$ Opponent | Amount$ 1 | Choices$ Permanent.YouCtrl+Other | RememberChosen$ True | Mandatory$ True | SubAbility$ ExileChoice
 SVar:ExileChoice:DB$ ChangeZone | Cost$ 0 | IsCurse$ True | Defined$ Remembered | Origin$ Battlefield | Destination$ Exile
 T:Mode$ ChangesZone | Origin$ Battlefield | Destination$ Any | ValidCard$ Card.Self | Execute$ TrigReturn | TriggerDescription$ When CARDNAME leaves the battlefield, return the exiled card to the battlefield under its owner's control.
 SVar:TrigReturn:AB$ ChangeZone | Cost$ 0 | Defined$ Remembered | Origin$ Exile | Destination$ Battlefield | SubAbility$ DBCleanup