diff --git a/src/w_wad.cpp b/src/w_wad.cpp
index 450abd056..4d8250fda 100644
--- a/src/w_wad.cpp
+++ b/src/w_wad.cpp
@@ -153,7 +153,7 @@ void FWadCollection::InitMultipleFiles (TArray<FString> &filenames)
 		int baselump = NumLumps;
 		AddFile (filenames[i]);
 
-		if (i == (unsigned)MaxIwadIndex) MoveLumpsInFolder("after_iwad/");
+		if (i == (unsigned)IwadIndex) MoveLumpsInFolder("after_iwad/");
 		FStringf path("filter/%s", Files.Last()->GetHash().GetChars());
 		MoveLumpsInFolder(path);
 	}