diff --git a/src/g_inventory/a_pickups.cpp b/src/g_inventory/a_pickups.cpp
index c82c146d2..4a7783ae4 100644
--- a/src/g_inventory/a_pickups.cpp
+++ b/src/g_inventory/a_pickups.cpp
@@ -699,6 +699,15 @@ void AInventory::AbsorbDamage (int damage, FName damageType, int &newdamage)
 {
 }
 
+DEFINE_ACTION_FUNCTION(AInventory, AbsorbDamage)
+{
+	PARAM_SELF_PROLOGUE(AInventory);
+	PARAM_INT(damage);
+	PARAM_NAME(type);
+	PARAM_POINTER(newdmg, int);
+	self->AbsorbDamage(damage, type, *newdmg);
+	return 0;
+}
 //===========================================================================
 //
 // AInventory :: ModifyDamage
diff --git a/src/p_interaction.cpp b/src/p_interaction.cpp
index d3dbe0232..a73e3d8b3 100644
--- a/src/p_interaction.cpp
+++ b/src/p_interaction.cpp
@@ -1385,7 +1385,7 @@ static int DamageMobj (AActor *target, AActor *inflictor, AActor *source, int da
 		if (!(flags & (DMG_NO_ARMOR|DMG_FORCED)) && target->Inventory != NULL && damage > 0)
 		{
 			int newdam = damage;
-			newdam = target->AbsorbDamage damage, mod);
+			newdam = target->AbsorbDamage(damage, mod);
 			damage = newdam;
 			if (damage <= 0)
 			{
diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index 4985454ae..5d86e78ff 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -3621,7 +3621,7 @@ int AActor::AbsorbDamage(int damage, FName dmgtype)
 	{
 		IFVIRTUALPTR(item, AInventory, AbsorbDamage)
 		{
-			VMValue params[4] = { (item, damage, dmgtype.GetIndex(), &damage };
+			VMValue params[4] = { item, damage, dmgtype.GetIndex(), &damage };
 			GlobalVMStack.Call(func, params, 4, nullptr, 0, nullptr);
 		}
 		else item->AbsorbDamage(damage, dmgtype, damage);
diff --git a/wadsrc/static/zscript/inventory/inventory.txt b/wadsrc/static/zscript/inventory/inventory.txt
index d3f6bfef5..7db3ba212 100644
--- a/wadsrc/static/zscript/inventory/inventory.txt
+++ b/wadsrc/static/zscript/inventory/inventory.txt
@@ -39,6 +39,7 @@ class Inventory : Actor native
 	virtual native void AttachToOwner(Actor user);
 	virtual native void DetachFromOwner();
 	virtual native bool DrawPowerup(int x, int y);
+	virtual native void AbsorbDamage (int damage, Name damageType, out int newdamage);
 	
 	//===========================================================================
 	//