diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index e519860c6031..06d1888f9179 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -950,7 +950,7 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 	vcpu->guest_debug = 0;
 	kvm_s390_clear_bp_data(vcpu);
 
-	if (vcpu->guest_debug & ~VALID_GUESTDBG_FLAGS)
+	if (dbg->control & ~VALID_GUESTDBG_FLAGS)
 		return -EINVAL;
 
 	if (dbg->control & KVM_GUESTDBG_ENABLE) {