diff --git a/reactos/drivers/storage/scsiport/scsiport.c b/reactos/drivers/storage/scsiport/scsiport.c
index d67d136be66..5c696620930 100644
--- a/reactos/drivers/storage/scsiport/scsiport.c
+++ b/reactos/drivers/storage/scsiport/scsiport.c
@@ -3286,7 +3286,7 @@ SpiAdapterControl(PDEVICE_OBJECT DeviceObject,
             break;
 
         ScatterGatherList->Length = Srb->DataTransferLength - TotalLength;
-        ScatterGatherList->PhysicalAddress = IoMapTransfer(NULL,
+        ScatterGatherList->PhysicalAddress = IoMapTransfer(DeviceExtension->AdapterObject,
                                                            Irp->MdlAddress,
                                                            MapRegisterBase,
                                                            DataVA + TotalLength,