diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 28a82e3..48616c6 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1282,7 +1282,7 @@
 	/* clear IRQ */
 	tmp = readl(port_mmio + PORT_IRQ_STAT);
 	writel(tmp, port_mmio + PORT_IRQ_STAT);
-	writel(1 << ap->id, mmio + HOST_IRQ_STAT);
+	writel(1 << ap->port_no, mmio + HOST_IRQ_STAT);
 
 	/* turn IRQ back on */
 	writel(DEF_PORT_IRQ, port_mmio + PORT_IRQ_MASK);