diff --git a/Mage.Sets/src/mage/sets/invasion/StalkingAssassin.java b/Mage.Sets/src/mage/sets/invasion/StalkingAssassin.java
index 559f5943d46..e89edd61256 100644
--- a/Mage.Sets/src/mage/sets/invasion/StalkingAssassin.java
+++ b/Mage.Sets/src/mage/sets/invasion/StalkingAssassin.java
@@ -31,6 +31,7 @@ import java.util.UUID;
 import mage.MageInt;
 import mage.abilities.Ability;
 import mage.abilities.common.SimpleActivatedAbility;
+import mage.abilities.costs.common.TapSourceCost;
 import mage.abilities.costs.mana.ManaCostsImpl;
 import mage.abilities.effects.common.DestroyTargetEffect;
 import mage.abilities.effects.common.TapTargetEffect;
@@ -65,10 +66,12 @@ public class StalkingAssassin extends CardImpl {
 
         // {3}{U}, {T}: Tap target creature.
         Ability ability = new SimpleActivatedAbility(Zone.BATTLEFIELD, new TapTargetEffect(), new ManaCostsImpl("{3}{U}"));
+        ability.addCost(new TapSourceCost());
         ability.addTarget(new TargetCreaturePermanent());
         this.addAbility(ability);
         // {3}{B}, {T}: Destroy target tapped creature.
         ability = new SimpleActivatedAbility(Zone.BATTLEFIELD, new DestroyTargetEffect(), new ManaCostsImpl("{3}{B}"));
+        ability.addCost(new TapSourceCost());
         ability.addTarget(new TargetCreaturePermanent(filter));
         this.addAbility(ability);
     }