diff --git a/qemu/target/riscv/cpu.c b/qemu/target/riscv/cpu.c
index 73f379c7..f3a6c951 100644
--- a/qemu/target/riscv/cpu.c
+++ b/qemu/target/riscv/cpu.c
@@ -411,6 +411,7 @@ void riscv_cpu_register_types(void *opaque) {
         .parent = TYPE_CPU,
         .instance_userdata = opaque,
         .instance_size = sizeof(RISCVCPU),
+        .instance_align = __alignof__(RISCVCPU),
         .instance_init = riscv_cpu_init,
         .abstract = true,
         .class_size = sizeof(RISCVCPUClass),