diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index 7d04dd3ef857..c842060c6c04 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -228,7 +228,7 @@ void kvm_pit_ack_irq(struct kvm_irq_ack_notifier *kian)
 						 irq_ack_notifier);
 	spin_lock(&ps->inject_lock);
 	if (atomic_dec_return(&ps->pit_timer.pending) < 0)
-		WARN_ON(1);
+		atomic_inc(&ps->pit_timer.pending);
 	ps->irq_ack = 1;
 	spin_unlock(&ps->inject_lock);
 }