diff --git a/src/main/java/com/trunksbomb/trade/client/TradeScreen.java b/src/main/java/com/trunksbomb/trade/client/TradeScreen.java
index 0a059dc..a6c09e8 100644
--- a/src/main/java/com/trunksbomb/trade/client/TradeScreen.java
+++ b/src/main/java/com/trunksbomb/trade/client/TradeScreen.java
@@ -197,6 +197,8 @@ public class TradeScreen extends AbstractContainerScreen<TradeScreen.TradeMenu>
         if (hoveredSlot instanceof GhostInventorySlot ghostInventorySlot) {
             if (button == 1) {
                 openContextMenu(mouseX, mouseY, TradeAction.ADD_ITEM, ghostInventorySlot.inventoryIndex(), hoveredSlot.getItem(), "Trade");
+            } else if (hasShiftDown()) {
+                sendAction(TradeAction.ADD_ITEM, ghostInventorySlot.inventoryIndex(), hoveredSlot.getItem().getCount());
             } else {
                 sendAction(TradeAction.ADD_ITEM, ghostInventorySlot.inventoryIndex(), 1);
             }