diff --git a/Scripts/Gumps/PlayerVendorGumps.cs b/Scripts/Gumps/PlayerVendorGumps.cs
index d7850782f..cf90a859f 100644
--- a/Scripts/Gumps/PlayerVendorGumps.cs
+++ b/Scripts/Gumps/PlayerVendorGumps.cs
@@ -55,7 +55,7 @@ namespace Server.Gumps
 
 			if ( info.ButtonID == 1 )
 			{
-				if ( !m_VI.Valid )
+				if ( !m_VI.Valid || !m_VI.Item.IsChildOf( m_Vendor.Backpack ) )
 				{
 					m_Vendor.SayTo( from, 503216 ); // You can't buy that.
 					return;