diff --git a/hw/vga.c b/hw/vga.c
index 2cde362..740fe28 100644
--- a/hw/vga.c
+++ b/hw/vga.c
@@ -1852,8 +1852,7 @@
     if (ds_get_bits_per_pixel(s->ds) == 0) {
         /* nothing to do */
     } else {
-        full_update = s->full_update;
-        s->full_update = 0;
+        full_update = 0;
         if (!(s->ar_index & 0x20)) {
             graphic_mode = GMODE_BLANK;
         } else {
@@ -1883,7 +1882,8 @@
 {
     VGACommonState *s = opaque;
 
-    s->full_update = 1;
+    s->last_width = -1;
+    s->last_height = -1;
 }
 
 void vga_common_reset(VGACommonState *s)
diff --git a/hw/vga_int.h b/hw/vga_int.h
index e70032c..c03c220 100644
--- a/hw/vga_int.h
+++ b/hw/vga_int.h
@@ -159,7 +159,6 @@
     uint32_t last_width, last_height; /* in chars or pixels */
     uint32_t last_scr_width, last_scr_height; /* in pixels */
     uint32_t last_depth; /* in bits */
-    uint8_t full_update;
     uint8_t cursor_start, cursor_end;
     uint32_t cursor_offset;
     unsigned int (*rgb_to_pixel)(unsigned int r,