diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index a3e55c613243..ed4190128812 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -5736,7 +5736,7 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
 		r = kvm_s390_handle_pv_vcpu_dump(vcpu, &cmd);
 
 		/* Always copy over UV rc / rrc data */
-		if (copy_to_user((__u8 __user *)argp, &cmd.rc,
+		if (copy_to_user(argp + offsetof(struct kvm_pv_cmd, rc), &cmd.rc,
 				 sizeof(cmd.rc) + sizeof(cmd.rrc)))
 			r = -EFAULT;
 		break;