diff --git a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
index 186d40c062..4d1b5848a5 100644
--- a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
+++ b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
@@ -1340,10 +1340,6 @@ AhciStartCommand (
   //
   // Setting the command
   //
-  Offset = EFI_AHCI_PORT_START + Port * EFI_AHCI_PORT_REG_WIDTH + EFI_AHCI_PORT_SACT;
-  AhciAndReg (PciIo, Offset, 0);
-  AhciOrReg (PciIo, Offset, CmdSlotBit);
-
   Offset = EFI_AHCI_PORT_START + Port * EFI_AHCI_PORT_REG_WIDTH + EFI_AHCI_PORT_CI;
   AhciAndReg (PciIo, Offset, 0);
   AhciOrReg (PciIo, Offset, CmdSlotBit);