diff --git a/src/actor.h b/src/actor.h
index ba1069042..7af666622 100644
--- a/src/actor.h
+++ b/src/actor.h
@@ -746,9 +746,6 @@ public:
 	// APlayerPawn for some specific handling for players. None of this
 	// should ever be overridden by custom classes.
 
-	// Adds the item to this actor's inventory and sets its Owner.
-	virtual void AddInventory (AInventory *item);
-
 	// Give an item to the actor and pick it up.
 	// Returns true if the item pickup succeeded.
 	bool GiveInventory (PClassActor *type, int amount, bool givecheat = false);
diff --git a/src/d_player.h b/src/d_player.h
index 67c409ba3..59b25814a 100644
--- a/src/d_player.h
+++ b/src/d_player.h
@@ -89,7 +89,6 @@ public:
 
 	virtual void PostBeginPlay() override;
 	virtual void Tick() override;
-	virtual void AddInventory (AInventory *item) override;
 	virtual void RemoveInventory (AInventory *item) override;
 	virtual bool UseInventory (AInventory *item) override;
 	virtual void BeginPlay () override;
diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index a9ff42c4a..02628d056 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -350,6 +350,7 @@ DEFINE_FIELD(AActor, RenderHidden)
 DEFINE_FIELD(AActor, RenderRequired)
 DEFINE_FIELD(AActor, friendlyseeblocks)
 DEFINE_FIELD(AActor, SpawnTime)
+DEFINE_FIELD(AActor, InventoryID)
 
 //==========================================================================
 //
@@ -752,46 +753,6 @@ DEFINE_ACTION_FUNCTION(AActor, SetState)
 	ACTION_RETURN_BOOL(self->SetState(state, nofunction));
 };
 
-//============================================================================
-//
-// AActor :: AddInventory
-//
-//============================================================================
-
-void AActor::AddInventory (AInventory *item)
-{
-	// Check if it's already attached to an actor
-	if (item->Owner != NULL)
-	{
-		// Is it attached to us?
-		if (item->Owner == this)
-			return;
-
-		// No, then remove it from the other actor first
-		item->Owner->RemoveInventory (item);
-	}
-
-	item->Owner = this;
-	item->Inventory = Inventory;
-	Inventory = item;
-
-	// Each item receives an unique ID when added to an actor's inventory.
-	// This is used by the DEM_INVUSE command to identify the item. Simply
-	// using the item's position in the list won't work, because ticcmds get
-	// run sometime in the future, so by the time it runs, the inventory
-	// might not be in the same state as it was when DEM_INVUSE was sent.
-	Inventory->InventoryID = InventoryID++;
-}
-
-DEFINE_ACTION_FUNCTION(AActor, AddInventory)
-{
-	PARAM_SELF_PROLOGUE(AActor);
-	PARAM_OBJECT_NOT_NULL(item, AInventory);
-	self->AddInventory(item);
-	return 0;
-}
-
-
 //============================================================================
 //
 // AActor :: GiveInventory
diff --git a/src/p_user.cpp b/src/p_user.cpp
index 1a9ef4b1f..d5103b660 100644
--- a/src/p_user.cpp
+++ b/src/p_user.cpp
@@ -938,29 +938,6 @@ void APlayerPawn::PostBeginPlay()
 	}
 }
 
-//===========================================================================
-//
-// APlayerPawn :: AddInventory
-//
-//===========================================================================
-
-void APlayerPawn::AddInventory (AInventory *item)
-{
-	// Adding inventory to a voodoo doll should add it to the real player instead.
-	if (player != NULL && player->mo != this && player->mo != NULL)
-	{
-		player->mo->AddInventory (item);
-		return;
-	}
-	Super::AddInventory (item);
-
-	// If nothing is selected, select this item.
-	if (InvSel == NULL && (item->ItemFlags & IF_INVBAR))
-	{
-		InvSel = item;
-	}
-}
-
 //===========================================================================
 //
 // APlayerPawn :: RemoveInventory
diff --git a/wadsrc/static/zscript.txt b/wadsrc/static/zscript.txt
index d04f99ae0..20f050cd9 100644
--- a/wadsrc/static/zscript.txt
+++ b/wadsrc/static/zscript.txt
@@ -8,6 +8,7 @@ version "3.7"
 #include "zscript/actor_attacks.txt"
 #include "zscript/actor_checks.txt"
 #include "zscript/actor_interaction.txt"
+#include "zscript/actor_inventory.txt"
 #include "zscript/events.txt"
 #include "zscript/destructible.txt"
 #include "zscript/level_compatibility.txt"
@@ -56,6 +57,7 @@ version "3.7"
 
 #include "zscript/shared/player.txt"
 #include "zscript/shared/player_cheat.txt"
+#include "zscript/shared/player_inventory.txt"
 #include "zscript/shared/morph.txt"
 #include "zscript/shared/botstuff.txt"
 #include "zscript/shared/sharedmisc.txt"
diff --git a/wadsrc/static/zscript/actor.txt b/wadsrc/static/zscript/actor.txt
index adb5f679d..f3211ece9 100644
--- a/wadsrc/static/zscript/actor.txt
+++ b/wadsrc/static/zscript/actor.txt
@@ -241,6 +241,7 @@ class Actor : Thinker native
 	native int RenderRequired;
 	native readonly int FriendlySeeBlocks;
 	native readonly int SpawnTime;
+	private native int InventoryID;	// internal counter.
 
 	meta String Obituary;		// Player was killed by this actor
 	meta String HitObituary;		// Player was killed by this actor in melee
@@ -740,7 +741,6 @@ class Actor : Thinker native
 	native clearscope int GetAge() const;
 
 	native bool CheckClass(class<Actor> checkclass, int ptr_select = AAPTR_DEFAULT, bool match_superclass = false);
-	native void AddInventory(Inventory inv);
 	native void RemoveInventory(Inventory inv);
 	native void ClearInventory();
 	protected native void DestroyAllInventory();	// This is not supposed to be called by user code!
diff --git a/wadsrc/static/zscript/actor_inventory.txt b/wadsrc/static/zscript/actor_inventory.txt
new file mode 100644
index 000000000..052e1f21f
--- /dev/null
+++ b/wadsrc/static/zscript/actor_inventory.txt
@@ -0,0 +1,34 @@
+extend class Actor
+{
+	//============================================================================
+	//
+	// AActor :: AddInventory
+	//
+	//============================================================================
+
+	virtual void AddInventory (Inventory item)
+	{
+		// Check if it's already attached to an actor
+		if (item.Owner != NULL)
+		{
+			// Is it attached to us?
+			if (item.Owner == self)
+				return;
+
+			// No, then remove it from the other actor first
+			item.Owner.RemoveInventory (item);
+		}
+
+		item.Owner = self;
+		item.Inv = Inv;
+		Inv = item;
+
+		// Each item receives an unique ID when added to an actor's inventory.
+		// This is used by the DEM_INVUSE command to identify the item. Simply
+		// using the item's position in the list won't work, because ticcmds get
+		// run sometime in the future, so by the time it runs, the inventory
+		// might not be in the same state as it was when DEM_INVUSE was sent.
+		Inv.InventoryID = InventoryID++;
+	}
+
+}
\ No newline at end of file
diff --git a/wadsrc/static/zscript/shared/player_inventory.txt b/wadsrc/static/zscript/shared/player_inventory.txt
new file mode 100644
index 000000000..c68c30814
--- /dev/null
+++ b/wadsrc/static/zscript/shared/player_inventory.txt
@@ -0,0 +1,26 @@
+extend class PlayerPawn
+{
+	//===========================================================================
+	//
+	// APlayerPawn :: AddInventory
+	//
+	//===========================================================================
+
+	override void AddInventory (Inventory item)
+	{
+		// Adding inventory to a voodoo doll should add it to the real player instead.
+		if (player != NULL && player.mo != self && player.mo != NULL)
+		{
+			player.mo.AddInventory (item);
+			return;
+		}
+		Super.AddInventory (item);
+
+		// If nothing is selected, select this item.
+		if (InvSel == NULL && item.bInvBar)
+		{
+			InvSel = item;
+		}
+	}
+
+}
\ No newline at end of file