diff --git a/src/g_shared/a_pickups.h b/src/g_shared/a_pickups.h
index 6c68990d1..22d1e009f 100644
--- a/src/g_shared/a_pickups.h
+++ b/src/g_shared/a_pickups.h
@@ -134,6 +134,8 @@ enum
 	IF_RESTRICTABSOLUTELY = 1<<19,	// RestrictedTo and ForbiddenTo do not allow pickup in any form by other classes
 	IF_NEVERRESPAWN		= 1<<20,	// Never, ever respawns
 	IF_NOSCREENFLASH	= 1<<21,	// No pickup flash on the player's screen
+	IF_TOSSED			= 1<<22,	// Was spawned by P_DropItem (i.e. as a monster drop)
+
 };
 
 
diff --git a/src/p_enemy.cpp b/src/p_enemy.cpp
index 5df2b4b5e..437940d03 100644
--- a/src/p_enemy.cpp
+++ b/src/p_enemy.cpp
@@ -3088,6 +3088,7 @@ AInventory *P_DropItem (AActor *source, const PClass *type, int dropamount, int
 			{
 				AInventory * inv = static_cast<AInventory *>(mo);
 				ModifyDropAmount(inv, dropamount);
+				inv->ItemFlags |= IF_TOSSED;
 				if (inv->SpecialDropAction (source))
 				{
 					// The special action indicates that the item should not spawn
diff --git a/src/thingdef/thingdef_data.cpp b/src/thingdef/thingdef_data.cpp
index 1f1c6ec00..57dd363c8 100644
--- a/src/thingdef/thingdef_data.cpp
+++ b/src/thingdef/thingdef_data.cpp
@@ -308,6 +308,7 @@ static FFlagDef InventoryFlags[] =
 	DEFINE_FLAG(IF, RESTRICTABSOLUTELY, AInventory, ItemFlags),
 	DEFINE_FLAG(IF, NEVERRESPAWN, AInventory, ItemFlags),
 	DEFINE_FLAG(IF, NOSCREENFLASH, AInventory, ItemFlags),
+	DEFINE_FLAG(IF, TOSSED, AInventory, ItemFlags),
 
 	DEFINE_DEPRECATED_FLAG(PICKUPFLASH),
 	DEFINE_DEPRECATED_FLAG(INTERHUBSTRIP),};