diff --git a/src/p_enemy.cpp b/src/p_enemy.cpp
index 72e9b6e09..a87e0c812 100644
--- a/src/p_enemy.cpp
+++ b/src/p_enemy.cpp
@@ -3210,64 +3210,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_ActiveSound)
 //---------------------------------------------------------------------------
 void ModifyDropAmount(AInventory *inv, int dropamount)
 {
-	auto flagmask = IF_IGNORESKILL;
-	double dropammofactor = G_SkillProperty(SKILLP_DropAmmoFactor);
-	// Default drop amount is half of regular amount * regular ammo multiplication
-	if (dropammofactor == -1) 
+	IFVIRTUALPTR(inv, AInventory, ModifyDropAmount)
 	{
-		dropammofactor = 0.5;
-		flagmask = ItemFlag(0);
+		VMValue params[] = { inv, dropamount };
+		VMCall(func, params, 2, nullptr, 0);
 	}
-
-	if (dropamount > 0)
-	{
-		if (flagmask != 0 && inv->IsKindOf(NAME_Ammo))
-		{
-			inv->Amount = int(dropamount * dropammofactor);
-			inv->ItemFlags |= IF_IGNORESKILL;
-		}
-		else
-		{
-			inv->Amount = dropamount;
-		}
-	}
-	else if (inv->IsKindOf (PClass::FindActor(NAME_Ammo)))
-	{
-		// Half ammo when dropped by bad guys.
-		int amount = inv->IntVar("DropAmount");
-		if (amount <= 0)
-		{
-			amount = MAX(1, int(inv->Amount * dropammofactor));
-		}
-		inv->Amount = amount;
-		inv->ItemFlags |= flagmask;
-	}
-	else if (inv->IsKindOf (PClass::FindActor(NAME_WeaponGiver)))
-	{
-		inv->FloatVar("AmmoFactor") = dropammofactor;
-		inv->ItemFlags |= flagmask;
-	}
-	else if (inv->IsKindOf(NAME_Weapon))
-	{
-		// The same goes for ammo from a weapon.
-		static_cast<AWeapon *>(inv)->AmmoGive1 = int(static_cast<AWeapon *>(inv)->AmmoGive1 * dropammofactor);
-		static_cast<AWeapon *>(inv)->AmmoGive2 = int(static_cast<AWeapon *>(inv)->AmmoGive2 * dropammofactor);
-		inv->ItemFlags |= flagmask;
-	}			
-	else if (inv->IsKindOf (PClass::FindClass(NAME_DehackedPickup)))
-	{
-		// For weapons and ammo modified by Dehacked we need to flag the item.
-		inv->BoolVar("droppedbymonster") = true;
-	}
-}
-
-// todo: make this a scripted virtual function so it can better deal with some of the classes involved.
-DEFINE_ACTION_FUNCTION(AInventory, ModifyDropAmount)
-{
-	PARAM_SELF_PROLOGUE(AInventory);
-	PARAM_INT(dropamount);
-	ModifyDropAmount(self, dropamount);
-	return 0;
 }
 
 //---------------------------------------------------------------------------
diff --git a/wadsrc/static/zscript/inventory/ammo.txt b/wadsrc/static/zscript/inventory/ammo.txt
index 092a93846..b08f39601 100644
--- a/wadsrc/static/zscript/inventory/ammo.txt
+++ b/wadsrc/static/zscript/inventory/ammo.txt
@@ -184,6 +184,48 @@ class Ammo : Inventory
 		return copy;
 	}
 
+	//---------------------------------------------------------------------------
+	//
+	// Modifies the drop amount of this item according to the current skill's
+	// settings (also called by ADehackedPickup::TryPickup)
+	//
+	//---------------------------------------------------------------------------
+	
+	override void ModifyDropAmount(int dropamount)
+	{
+		bool ignoreskill = true;
+		double dropammofactor = G_SkillPropertyFloat(SKILLP_DropAmmoFactor);
+		// Default drop amount is half of regular amount * regular ammo multiplication
+		if (dropammofactor == -1) 
+		{
+			dropammofactor = 0.5;
+			ignoreskill = false;
+		}
+
+		if (dropamount > 0)
+		{
+			if (ignoreskill)
+			{
+				self.Amount = int(dropamount * dropammofactor);
+				bIgnoreSkill = true;
+			}
+			else
+			{
+				self.Amount = dropamount;
+			}
+		}
+		else
+		{
+			// Half ammo when dropped by bad guys.
+			int amount = self.DropAmount;
+			if (amount <= 0)
+			{
+				amount = MAX(1, int(self.Amount * dropammofactor));
+			}
+			self.Amount = amount;
+			bIgnoreSkill = ignoreskill;
+		}
+	}
 	
 }
 
diff --git a/wadsrc/static/zscript/inventory/inventory.txt b/wadsrc/static/zscript/inventory/inventory.txt
index d724c90d9..b903a09b6 100644
--- a/wadsrc/static/zscript/inventory/inventory.txt
+++ b/wadsrc/static/zscript/inventory/inventory.txt
@@ -52,7 +52,6 @@ class Inventory : Actor native
 	native bool DoRespawn();
 	native void BecomeItem();
 	native void BecomePickup();
-	native void ModifyDropAmount(int dropamount);
 	native static void PrintPickupMessage (bool localview, String str);
 
 	States(Actor)
@@ -917,6 +916,22 @@ class Inventory : Actor native
 	//===========================================================================
 
 	virtual void OnDrop (Actor dropper) {}
+	
+	//---------------------------------------------------------------------------
+	//
+	// Modifies the drop amount of this item according to the current skill's
+	// settings (also called by ADehackedPickup::TryPickup)
+	//
+	//---------------------------------------------------------------------------
+	
+	virtual void ModifyDropAmount(int dropamount)
+	{
+		if (dropamount > 0)
+		{
+			Amount = dropamount;
+		}
+	}
+	
 }
 
 //===========================================================================
@@ -1014,6 +1029,14 @@ class DehackedPickup : Inventory
 		}
 		Super.OnDestroy();
 	}
+	
+	override void ModifyDropAmount(int dropamount)
+	{
+		// Must forward the adjustment to the real item.
+		// dropamount is not relevant here because Dehacked cannot change it.
+		droppedbymonster = true;
+	}
+	
 }
 
 //===========================================================================
diff --git a/wadsrc/static/zscript/inventory/weapons.txt b/wadsrc/static/zscript/inventory/weapons.txt
index dd63a6159..9f4196de2 100644
--- a/wadsrc/static/zscript/inventory/weapons.txt
+++ b/wadsrc/static/zscript/inventory/weapons.txt
@@ -842,6 +842,33 @@ class Weapon : StateProvider native
 	}
 
 
+	//---------------------------------------------------------------------------
+	//
+	// Modifies the drop amount of this item according to the current skill's
+	// settings (also called by ADehackedPickup::TryPickup)
+	//
+	//---------------------------------------------------------------------------
+	override void ModifyDropAmount(int dropamount)
+	{
+		bool ignoreskill = true;
+		double dropammofactor = G_SkillPropertyFloat(SKILLP_DropAmmoFactor);
+		// Default drop amount is half of regular amount * regular ammo multiplication
+		if (dropammofactor == -1) 
+		{
+			dropammofactor = 0.5;
+			ignoreskill = false;
+		}
+
+		if (dropamount > 0)
+		{
+			self.Amount = dropamount;
+		}
+		// Adjust the ammo given by this weapon
+		AmmoGive1 = int(AmmoGive1 * dropammofactor);
+		AmmoGive2 = int(AmmoGive2 * dropammofactor);
+		bIgnoreSkill = ignoreskill;
+	}
+	
 }
 
 class WeaponGiver : Weapon
@@ -905,6 +932,29 @@ class WeaponGiver : Weapon
 		return false;
 	}
 	
+	//---------------------------------------------------------------------------
+	//
+	// Modifies the drop amount of this item according to the current skill's
+	// settings (also called by ADehackedPickup::TryPickup)
+	//
+	//---------------------------------------------------------------------------
+
+	override void ModifyDropAmount(int dropamount)
+	{
+		bool ignoreskill = true;
+		double dropammofactor = G_SkillPropertyFloat(SKILLP_DropAmmoFactor);
+		// Default drop amount is half of regular amount * regular ammo multiplication
+		if (dropammofactor == -1) 
+		{
+			dropammofactor = 0.5;
+			ignoreskill = false;
+		}
+
+		AmmoFactor = dropammofactor;
+		bIgnoreSkill = ignoreskill;
+	}
+	
+	
 }
 
 struct WeaponSlots native