diff --git a/hw/vga.c b/hw/vga.c
index 7be51419ef..f9a6014f4e 100644
--- a/hw/vga.c
+++ b/hw/vga.c
@@ -181,6 +181,7 @@ static void vga_update_memory_access(VGACommonState *s)
             size = 0x8000;
             break;
         }
+        base += isa_mem_base;
         region = g_malloc(sizeof(*region));
         memory_region_init_alias(region, "vga.chain4", &s->vram, offset, size);
         memory_region_add_subregion_overlap(s->legacy_address_space, base,