diff --git a/hw/arm/aspeed.c b/hw/arm/aspeed.c
index 854413594d..f5916e8126 100644
--- a/hw/arm/aspeed.c
+++ b/hw/arm/aspeed.c
@@ -376,6 +376,7 @@ static void aspeed_machine_init(MachineState *machine)
     if (drive0) {
         AspeedSMCFlash *fl = &bmc->soc.fmc.flashes[0];
         MemoryRegion *boot_rom = g_new(MemoryRegion, 1);
+        uint64_t size = memory_region_size(&fl->mmio);
 
         /*
          * create a ROM region using the default mapping window size of
@@ -385,15 +386,15 @@ static void aspeed_machine_init(MachineState *machine)
          */
         if (ASPEED_MACHINE(machine)->mmio_exec) {
             memory_region_init_alias(boot_rom, NULL, "aspeed.boot_rom",
-                                     &fl->mmio, 0, fl->size);
+                                     &fl->mmio, 0, size);
             memory_region_add_subregion(get_system_memory(), FIRMWARE_ADDR,
                                         boot_rom);
         } else {
             memory_region_init_rom(boot_rom, NULL, "aspeed.boot_rom",
-                                   fl->size, &error_abort);
+                                   size, &error_abort);
             memory_region_add_subregion(get_system_memory(), FIRMWARE_ADDR,
                                         boot_rom);
-            write_boot_rom(drive0, FIRMWARE_ADDR, fl->size, &error_abort);
+            write_boot_rom(drive0, FIRMWARE_ADDR, size, &error_abort);
         }
     }
 
diff --git a/hw/ssi/aspeed_smc.c b/hw/ssi/aspeed_smc.c
index 5466be6317..3e4221311a 100644
--- a/hw/ssi/aspeed_smc.c
+++ b/hw/ssi/aspeed_smc.c
@@ -1186,11 +1186,10 @@ static void aspeed_smc_realize(DeviceState *dev, Error **errp)
 
         fl->id = i;
         fl->controller = s;
-        fl->size = asc->segments[i].size;
         memory_region_init_io(&fl->mmio, OBJECT(s), &aspeed_smc_flash_ops,
-                              fl, name, fl->size);
+                              fl, name, asc->segments[i].size);
         memory_region_add_subregion(&s->mmio_flash, offset, &fl->mmio);
-        offset += fl->size;
+        offset += asc->segments[i].size;
     }
 
     /* DMA support */
diff --git a/include/hw/ssi/aspeed_smc.h b/include/hw/ssi/aspeed_smc.h
index f32f66f9a8..097bb6aaf5 100644
--- a/include/hw/ssi/aspeed_smc.h
+++ b/include/hw/ssi/aspeed_smc.h
@@ -34,7 +34,6 @@ typedef struct AspeedSMCFlash {
     struct AspeedSMCState *controller;
 
     uint8_t id;
-    uint32_t size;
 
     MemoryRegion mmio;
 } AspeedSMCFlash;