diff --git a/eco-api/src/main/kotlin/com/willfp/eco/core/gui/GUIHelpers.kt b/eco-api/src/main/kotlin/com/willfp/eco/core/gui/GUIHelpers.kt
index bf3a9b11..cc52a541 100644
--- a/eco-api/src/main/kotlin/com/willfp/eco/core/gui/GUIHelpers.kt
+++ b/eco-api/src/main/kotlin/com/willfp/eco/core/gui/GUIHelpers.kt
@@ -32,6 +32,10 @@ fun SlotBuilder.onShiftRightClick(action: (InventoryClickEvent, Slot, Menu) -> U
 fun SlotBuilder.onMiddleClick(action: (InventoryClickEvent, Slot, Menu) -> Unit): SlotBuilder =
     this.onMiddleClick { a, b, c -> action(a, b, c) }
 
+/** @see SlotBuilder.setCaptive */
+fun SlotBuilder.setCaptive(default: (Player) -> TestableItem?): SlotBuilder =
+    this.setCaptive { a -> default(a) }
+
 /**
  * @see SlotBuilder.setModifier
  * @deprecated Use SlotUpdater instead.