diff --git a/hw/i8259.c b/hw/i8259.c
index 6587666..c011787 100644
--- a/hw/i8259.c
+++ b/hw/i8259.c
@@ -143,22 +143,23 @@ static void pic_set_irq(void *opaque, int irq, int level)
     if (s->elcr & mask) {
         /* level triggered */
         if (level) {
             s->irr |= mask;
             s->last_irr |= mask;
         } else {
             s->irr &= ~mask;
             s->last_irr &= ~mask;
         }
     } else {
         /* edge triggered */
         if (level) {
             if ((s->last_irr & mask) == 0) {
                 s->irr |= mask;
             }
             s->last_irr |= mask;
         } else {
+            s->irr &= ~mask;
             s->last_irr &= ~mask;
         }
     }
     pic_update_irq(s);
 }