diff --git a/src/w_wad.c b/src/w_wad.c
index 40fea5223..aeaad3ced 100644
--- a/src/w_wad.c
+++ b/src/w_wad.c
@@ -475,11 +475,11 @@ UINT16 W_LoadWadFile(const char *filename)
 	//
 	CONS_Printf(M_GetText("Added file %s (%u lumps)\n"), filename, numlumps);
 	wadfiles[numwadfiles] = wadfile;
-	W_LoadDehackedLumps(numwadfiles);
+	numwadfiles++; // must come BEFORE W_LoadDehackedLumps, so any addfile called by COM_BufInsertText called by Lua doesn't overwrite what we just loaded
+	W_LoadDehackedLumps(numwadfiles-1);
 
 	W_InvalidateLumpnumCache();
 
-	numwadfiles++;
 	return wadfile->numlumps;
 }