diff --git a/hw/framebuffer.c b/hw/framebuffer.c
index ea122fb266..f4747cd646 100644
--- a/hw/framebuffer.c
+++ b/hw/framebuffer.c
@@ -87,7 +87,7 @@ void framebuffer_update_display(
     dest += i * dest_row_pitch;
 
     for (; i < rows; i++) {
-        dirty = memory_region_get_dirty(mem, addr, addr + src_width,
+        dirty = memory_region_get_dirty(mem, addr, src_width,
                                              DIRTY_MEMORY_VGA);
         if (dirty || invalidate) {
             fn(opaque, dest, src, cols, dest_col_pitch);
diff --git a/hw/sm501.c b/hw/sm501.c
index 94c0abf4cb..786e07629c 100644
--- a/hw/sm501.c
+++ b/hw/sm501.c
@@ -1327,8 +1327,8 @@ static void sm501_draw_crt(SM501State * s)
         ram_addr_t page1 = offset + width * src_bpp - 1;
 
 	/* check dirty flags for each line */
-        update = memory_region_get_dirty(&s->local_mem_region, page0, page1,
-                                         DIRTY_MEMORY_VGA);
+        update = memory_region_get_dirty(&s->local_mem_region, page0,
+                                         page1 - page0, DIRTY_MEMORY_VGA);
 
 	/* draw line and change status */
 	if (update) {
diff --git a/hw/vga.c b/hw/vga.c
index d87c4f9f5b..d27700d41b 100644
--- a/hw/vga.c
+++ b/hw/vga.c
@@ -1779,7 +1779,7 @@ static void vga_draw_graphic(VGACommonState *s, int full_update)
         }
         page0 = addr;
         page1 = addr + bwidth - 1;
-        update = memory_region_get_dirty(&s->vram, page0, page1,
+        update = memory_region_get_dirty(&s->vram, page0, page1 - page0,
                                          DIRTY_MEMORY_VGA);
         /* explicit invalidation for the hardware cursor */
         update |= (s->invalidated_y_table[y >> 5] >> (y & 0x1f)) & 1;