diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index 16304b1..7fe0c91 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -53,6 +53,7 @@
 u64 kvm_lapic_get_base(struct kvm_vcpu *vcpu);
 void kvm_apic_set_version(struct kvm_vcpu *vcpu);
 
+void kvm_apic_update_tmr(struct kvm_vcpu *vcpu, u32 *tmr);
 int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest);
 int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda);
 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,