diff --git a/zsnes/src/dos/dosintrf.asm b/zsnes/src/dos/dosintrf.asm
index fbf84caa..b5858cfd 100644
--- a/zsnes/src/dos/dosintrf.asm
+++ b/zsnes/src/dos/dosintrf.asm
@@ -1064,6 +1064,7 @@ NEWSYM GUII2VID, db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0     ; Super 2xSAI En
 NEWSYM GUIM7VID, db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0     ; Hi-Resolution Mode 7
 NEWSYM GUIBIFIL, db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0     ; Bilinear Filtering
 NEWSYM GUITBWVID, db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0    ; Triple Buffering (Win)
+NEWSYM GUIHQ3X, db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0      ; HQ3X Filter
 SECTION .text
 
 ; ****************************