diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2982e3bc2821..d9cff1f8dff3 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2876,7 +2876,8 @@ static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
 	if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL))
 		return -EINVAL;
 
-	banks += array_index_nospec(4 * mce->bank, 4 * bank_num);
+	mce->bank = array_index_nospec(mce->bank, bank_num);
+	banks += 4 * mce->bank;
 
 	if (is_ucna(mce))
 		return kvm_vcpu_x86_set_ucna(vcpu, mce, banks);