diff --git a/src/include/86box/vid_cga.h b/src/include/86box/vid_cga.h
index f49fc73cc..5b6a2dea2 100644
--- a/src/include/86box/vid_cga.h
+++ b/src/include/86box/vid_cga.h
@@ -66,6 +66,7 @@ typedef struct cga_t {
     int composite;
     int snow_enabled;
     int rgb_type;
+    int double_type;
 } cga_t;
 
 void    cga_init(cga_t *cga);