diff --git a/hw/misc/aspeed_sdmc.c b/hw/misc/aspeed_sdmc.c
index f3a63a2e01..2df3244b53 100644
--- a/hw/misc/aspeed_sdmc.c
+++ b/hw/misc/aspeed_sdmc.c
@@ -208,10 +208,10 @@ static int ast2600_rambits(AspeedSDMCState *s)
     }
 
     /* use a common default */
-    warn_report("Invalid RAM size 0x%" PRIx64 ". Using default 512M",
+    warn_report("Invalid RAM size 0x%" PRIx64 ". Using default 1024M",
                 s->ram_size);
-    s->ram_size = 512 << 20;
-    return ASPEED_SDMC_AST2600_512MB;
+    s->ram_size = 1024 << 20;
+    return ASPEED_SDMC_AST2600_1024MB;
 }
 
 static void aspeed_sdmc_reset(DeviceState *dev)