diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index 17f8d5d5930555872840587aafc4fd042f3e8bc1..2fc42117d0c96ce64e9ba2547012ce52f678dcd8 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -385,7 +385,6 @@ static QEMUMachine pc_machine_v0_15 = {
     .desc = "Standard PC",
     .init = pc_init_pci,
     .max_cpus = 255,
-    .is_default = 1,
 };
 
 static QEMUMachine pc_machine_v0_14 = {