diff --git a/eco-api/src/main/java/com/willfp/eco/core/gui/slot/Slot.java b/eco-api/src/main/java/com/willfp/eco/core/gui/slot/Slot.java
index 5995e11b..6fb28ddd 100644
--- a/eco-api/src/main/java/com/willfp/eco/core/gui/slot/Slot.java
+++ b/eco-api/src/main/java/com/willfp/eco/core/gui/slot/Slot.java
@@ -2,12 +2,10 @@ package com.willfp.eco.core.gui.slot;
 
 import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.gui.slot.functional.SlotProvider;
-import com.willfp.eco.core.items.TestableItem;
 import org.bukkit.Material;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 
 import java.util.function.Function;
 
@@ -30,14 +28,6 @@ public interface Slot {
      */
     boolean isCaptive();
 
-    /**
-     * Get default captive item.
-     *
-     * @param player The player.
-     * @return The item, or null if no captive default was found.
-     */
-    @Nullable TestableItem getCaptiveDefault(@NotNull Player player);
-
     /**
      * Create a builder for an ItemStack.
      *
diff --git a/eco-api/src/main/java/com/willfp/eco/core/gui/slot/SlotBuilder.java b/eco-api/src/main/java/com/willfp/eco/core/gui/slot/SlotBuilder.java
index af517a45..caed0b72 100644
--- a/eco-api/src/main/java/com/willfp/eco/core/gui/slot/SlotBuilder.java
+++ b/eco-api/src/main/java/com/willfp/eco/core/gui/slot/SlotBuilder.java
@@ -3,14 +3,10 @@ package com.willfp.eco.core.gui.slot;
 import com.willfp.eco.core.gui.slot.functional.SlotHandler;
 import com.willfp.eco.core.gui.slot.functional.SlotModifier;
 import com.willfp.eco.core.gui.slot.functional.SlotUpdater;
-import com.willfp.eco.core.items.TestableItem;
-import org.bukkit.entity.Player;
 import org.bukkit.event.inventory.InventoryClickEvent;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 
 import java.util.function.BiConsumer;
-import java.util.function.Function;
 
 /**
  * Builder to create slots.
@@ -134,17 +130,7 @@ public interface SlotBuilder {
      *
      * @return The builder.
      */
-    default SlotBuilder setCaptive() {
-        return setCaptive(null);
-    }
-
-    /**
-     * Set slot to be a captive default with a default provider.
-     *
-     * @param provider The provider.
-     * @return The builder.
-     */
-    SlotBuilder setCaptive(@Nullable Function<Player, TestableItem> provider);
+    SlotBuilder setCaptive();
 
     /**
      * Build the slot.
diff --git a/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/MenuRenderedInventory.kt b/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/MenuRenderedInventory.kt
index 20994f0d..6f6f5dd4 100644
--- a/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/MenuRenderedInventory.kt
+++ b/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/MenuRenderedInventory.kt
@@ -43,10 +43,7 @@ class MenuRenderedInventory(
                 val renderedItem = slot.getItemStack(player)
                 val itemStack = inventory.getItem(i) ?: continue
 
-                val isCaptiveDefault = (slot.getCaptiveDefault(player)?.matches(itemStack))
-                    ?: (renderedItem == itemStack)
-
-                if (isCaptiveDefault || itemStack.type.isAir || itemStack.amount == 0) {
+                if (itemStack == renderedItem || itemStack.type.isAir || itemStack.amount == 0) {
                     continue
                 }
 
diff --git a/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoCaptiveSlot.kt b/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoCaptiveSlot.kt
index 109f9d43..cb9ada47 100644
--- a/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoCaptiveSlot.kt
+++ b/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoCaptiveSlot.kt
@@ -2,12 +2,9 @@ package com.willfp.eco.internal.gui.slot
 
 import com.willfp.eco.core.gui.slot.functional.SlotHandler
 import com.willfp.eco.core.gui.slot.functional.SlotProvider
-import com.willfp.eco.core.items.TestableItem
-import org.bukkit.entity.Player
 
 class EcoCaptiveSlot(
-    provider: SlotProvider,
-    private val captiveDefault: ((Player) -> TestableItem?)?
+    provider: SlotProvider
 ) : EcoSlot(
     provider,
     allowMovingItem,
@@ -20,12 +17,8 @@ class EcoCaptiveSlot(
     override fun isCaptive(): Boolean {
         return true
     }
-
-    override fun getCaptiveDefault(player: Player): TestableItem? {
-        return captiveDefault?.invoke(player)
-    }
 }
 
 private val allowMovingItem = SlotHandler { event, _, _ ->
     event.isCancelled = false
-}
+}
\ No newline at end of file
diff --git a/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoSlot.kt b/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoSlot.kt
index 66eebbd8..84857be5 100644
--- a/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoSlot.kt
+++ b/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoSlot.kt
@@ -5,7 +5,6 @@ import com.willfp.eco.core.gui.slot.Slot
 import com.willfp.eco.core.gui.slot.functional.SlotHandler
 import com.willfp.eco.core.gui.slot.functional.SlotProvider
 import com.willfp.eco.core.gui.slot.functional.SlotUpdater
-import com.willfp.eco.core.items.TestableItem
 import com.willfp.eco.internal.gui.menu.getMenu
 import org.bukkit.Material
 import org.bukkit.entity.Player
@@ -56,8 +55,4 @@ open class EcoSlot(
     override fun isCaptive(): Boolean {
         return false
     }
-
-    override fun getCaptiveDefault(player: Player): TestableItem? {
-        return null
-    }
 }
\ No newline at end of file
diff --git a/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoSlotBuilder.kt b/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoSlotBuilder.kt
index 007aa0de..d4f7da97 100644
--- a/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoSlotBuilder.kt
+++ b/eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoSlotBuilder.kt
@@ -5,13 +5,9 @@ import com.willfp.eco.core.gui.slot.SlotBuilder
 import com.willfp.eco.core.gui.slot.functional.SlotHandler
 import com.willfp.eco.core.gui.slot.functional.SlotProvider
 import com.willfp.eco.core.gui.slot.functional.SlotUpdater
-import com.willfp.eco.core.items.TestableItem
-import org.bukkit.entity.Player
-import java.util.function.Function
 
 class EcoSlotBuilder(private val provider: SlotProvider) : SlotBuilder {
     private var captive = false
-    private var captiveDefault: ((Player) -> TestableItem?)? = null
     private var updater: SlotUpdater = SlotUpdater { player, menu, _ -> provider.provide(player, menu) }
 
     private var onLeftClick =
@@ -50,11 +46,8 @@ class EcoSlotBuilder(private val provider: SlotProvider) : SlotBuilder {
         return this
     }
 
-    override fun setCaptive(provider: Function<Player, TestableItem>?): SlotBuilder {
+    override fun setCaptive(): SlotBuilder {
         captive = true
-        if (provider != null) {
-            captiveDefault = { provider.apply(it) }
-        }
         return this
     }
 
@@ -65,7 +58,7 @@ class EcoSlotBuilder(private val provider: SlotProvider) : SlotBuilder {
 
     override fun build(): Slot {
         return if (captive) {
-            EcoCaptiveSlot(provider, captiveDefault)
+            EcoCaptiveSlot(provider)
         } else {
             EcoSlot(provider, onLeftClick, onRightClick, onShiftLeftClick, onShiftRightClick, onMiddleClick, updater)
         }