diff --git a/reactos/drivers/bus/pci/pdo.c b/reactos/drivers/bus/pci/pdo.c
index 2b882202440..a8e6271bf24 100644
--- a/reactos/drivers/bus/pci/pdo.c
+++ b/reactos/drivers/bus/pci/pdo.c
@@ -157,6 +157,7 @@ PdoQueryCapabilities(
 {
   PPDO_DEVICE_EXTENSION DeviceExtension;
   PDEVICE_CAPABILITIES DeviceCapabilities;
+  ULONG DeviceNumber, FunctionNumber;
 
   DPRINT("Called\n");
 
@@ -166,8 +167,11 @@ PdoQueryCapabilities(
   if (DeviceCapabilities->Version != 1)
     return STATUS_UNSUCCESSFUL;
 
+  DeviceNumber = DeviceExtension->PciDevice->SlotNumber.u.bits.DeviceNumber;
+  FunctionNumber = DeviceExtension->PciDevice->SlotNumber.u.bits.FunctionNumber;
+
   DeviceCapabilities->UniqueID = FALSE;
-  DeviceCapabilities->Address = DeviceExtension->PciDevice->SlotNumber.u.AsULONG;
+  DeviceCapabilities->Address = ((DeviceNumber << 16) & 0xFFFF0000) + (FunctionNumber & 0xFFFF);
   DeviceCapabilities->UINumber = (ULONG)-1; /* FIXME */
 
   return STATUS_SUCCESS;
diff --git a/reactos/drivers/network/ndis/ndis/miniport.c b/reactos/drivers/network/ndis/ndis/miniport.c
index 3080568c6d0..284b45eb198 100644
--- a/reactos/drivers/network/ndis/ndis/miniport.c
+++ b/reactos/drivers/network/ndis/ndis/miniport.c
@@ -1404,7 +1404,18 @@ NdisIPnPStartDevice(
       else
         Adapter->NdisMiniportBlock.SlotNumber = 0;
     }
+  else
+    {
+        /* Convert slotnumber to PCI_SLOT_NUMBER */
+        ULONG PciSlotNumber = Adapter->NdisMiniportBlock.SlotNumber;
+        PCI_SLOT_NUMBER SlotNumber;
 
+        SlotNumber.u.AsULONG = 0;
+        SlotNumber.u.bits.DeviceNumber = (PciSlotNumber >> 16) & 0xFFFF;
+        SlotNumber.u.bits.FunctionNumber = PciSlotNumber & 0xFFFF;
+
+        Adapter->NdisMiniportBlock.SlotNumber = SlotNumber.u.AsULONG;
+    }
   NdisCloseConfiguration(ConfigHandle);
 
   /*
diff --git a/reactos/drivers/video/videoprt/videoprt.c b/reactos/drivers/video/videoprt/videoprt.c
index 39680805c22..960390e9b3e 100644
--- a/reactos/drivers/video/videoprt/videoprt.c
+++ b/reactos/drivers/video/videoprt/videoprt.c
@@ -227,6 +227,8 @@ IntVideoPortCreateAdapterDeviceObject(
 {
    PVIDEO_PORT_DEVICE_EXTENSION DeviceExtension;
    ULONG DeviceNumber;
+   ULONG PciSlotNumber;
+   PCI_SLOT_NUMBER SlotNumber;
    ULONG Size;
    NTSTATUS Status;
    WCHAR DeviceBuffer[20];
@@ -345,8 +347,14 @@ IntVideoPortCreateAdapterDeviceObject(
          PhysicalDeviceObject,
          DevicePropertyAddress,
          Size,
-         &DeviceExtension->SystemIoSlotNumber,
+         &PciSlotNumber,
          &Size);
+
+        /* Convert slotnumber to PCI_SLOT_NUMBER */
+        SlotNumber.u.AsULONG = 0;
+        SlotNumber.u.bits.DeviceNumber = (PciSlotNumber >> 16) & 0xFFFF;
+        SlotNumber.u.bits.FunctionNumber = PciSlotNumber & 0xFFFF;
+        DeviceExtension->SystemIoSlotNumber = SlotNumber.u.AsULONG;
    }
 
    InitializeListHead(&DeviceExtension->AddressMappingListHead);