diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index a19f46c301..2aea9c3e12 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -330,11 +330,7 @@ static void ahci_port_write(AHCIState *s, int port, int offset, uint32_t val)
         check_cmd(s, port);
         break;
     case PORT_TFDATA:
-        /* Read Only. */
-        break;
     case PORT_SIG:
-        /* Read Only */
-        break;
     case PORT_SCR_STAT:
         /* Read Only */
         break;