diff --git a/src/main/kotlin/net/axay/kspigot/inventory/elements/InventoryGUIButton.kt b/src/main/kotlin/net/axay/kspigot/inventory/elements/InventoryGUIButton.kt
index f8015f3d..8dcb1580 100644
--- a/src/main/kotlin/net/axay/kspigot/inventory/elements/InventoryGUIButton.kt
+++ b/src/main/kotlin/net/axay/kspigot/inventory/elements/InventoryGUIButton.kt
@@ -5,7 +5,7 @@ import org.bukkit.inventory.ItemStack
 
 open class InventoryGUIButton<T : ForInventory>(
     private val icon: ItemStack,
-    val action: (InventoryGUIClickEvent<T>) -> Unit,
+    private val action: (InventoryGUIClickEvent<T>) -> Unit,
 ) : InventoryGUIElement<T>() {
 
     override fun getItemStack(slot: Int) = icon