diff --git a/nms-patches/PlayerConnection.patch b/nms-patches/PlayerConnection.patch
index 5a557edda0..3e77187ab5 100644
--- a/nms-patches/PlayerConnection.patch
+++ b/nms-patches/PlayerConnection.patch
@@ -1310,8 +1310,8 @@
 +                        }
 +                        break;
 +                    case SWAP:
-+                        if (packetplayinwindowclick.d() >= 0 && packetplayinwindowclick.d() < 9) {
-+                            click = ClickType.NUMBER_KEY;
++                        if ((packetplayinwindowclick.d() >= 0 && packetplayinwindowclick.d() < 9) || packetplayinwindowclick.d() == 40) {
++                            click = (packetplayinwindowclick.d() == 40) ? ClickType.SWAP_OFFHAND : ClickType.NUMBER_KEY;
 +                            Slot clickedSlot = this.player.activeContainer.getSlot(packetplayinwindowclick.c());
 +                            if (clickedSlot.isAllowed(player)) {
 +                                ItemStack hotbar = this.player.inventory.getItem(packetplayinwindowclick.d());