diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index 37ae2ad3..2fd51b5a 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -7964,6 +7964,7 @@ PS_VDGDC	.TEXT	"GDC$"
 PS_VDTMS	.TEXT	"TMS$"
 PS_VDVGA	.TEXT	"VGA$"
 PS_VDVRC	.TEXT	"VRC$"
+PS_VDEF		.TEXT	"EF$"
 PS_VDFV		.TEXT	"FV$"
 ;
 ; VIDEO TYPE STRINGS