diff --git a/hw/ioapic.c b/hw/ioapic.c
index 569327d1e9..8557e5cac6 100644
--- a/hw/ioapic.c
+++ b/hw/ioapic.c
@@ -164,6 +164,7 @@ static void ioapic_set_irq(void *opaque, int vector, int level)
             if (level) {
                 s->irr |= mask;
                 ioapic_service(s);
+                s->irr &= ~mask;
             }
         }
     }