diff --git a/SteamKit2/SteamKit2/Steam/Handlers/SteamApps/SteamApps.cs b/SteamKit2/SteamKit2/Steam/Handlers/SteamApps/SteamApps.cs
index ae18938c9..ca2682da8 100644
--- a/SteamKit2/SteamKit2/Steam/Handlers/SteamApps/SteamApps.cs
+++ b/SteamKit2/SteamKit2/Steam/Handlers/SteamApps/SteamApps.cs
@@ -252,7 +252,7 @@ public AsyncJobMultiple<PICSProductInfoCallback> PICSGetProductInfo( IEnumerable
 
             if ( packages == null )
             {
-                throw new ArgumentNullException( nameof(apps) );
+                throw new ArgumentNullException( nameof(packages) );
             }
 
             var request = new ClientMsgProtobuf<CMsgClientPICSProductInfoRequest>( EMsg.ClientPICSProductInfoRequest );