diff --git a/src/main/java/vswe/production/gui/container/slot/SlotUnitCraftingStorage.java b/src/main/java/vswe/production/gui/container/slot/SlotUnitCraftingStorage.java
index fc76add..b5ef95e 100644
--- a/src/main/java/vswe/production/gui/container/slot/SlotUnitCraftingStorage.java
+++ b/src/main/java/vswe/production/gui/container/slot/SlotUnitCraftingStorage.java
@@ -31,6 +31,12 @@ public boolean canAcceptItems() {
         return true;
     }
 
+    @Override
+    public boolean canSupplyItems()
+    {
+        return table.getUpgradePage().hasGlobalUpgrade(Upgrade.FILTER);
+    }
+
     @Override
     public boolean shouldSlotHighlightItems() {
         return false;