diff --git a/reactos/drivers/usb/usbd/usbd.spec b/reactos/drivers/usb/usbd/usbd.spec
index 5f6f8349ab0..7b98b931d00 100644
--- a/reactos/drivers/usb/usbd/usbd.spec
+++ b/reactos/drivers/usb/usbd/usbd.spec
@@ -1,9 +1,9 @@
-USBD_Debug_GetHeap(long long long long)
-USBD_Debug_RetHeap(ptr long long)
-USBD_CalculateUsbBandwidth(long long long)
-USBD_CreateConfigurationRequestEx(ptr ptr)
-USBD_CreateConfigurationRequest(ptr ptr)
-USBD_GetInterfaceLength(ptr ptr)
-USBD_ParseConfigurationDescriptorEx(ptr ptr long long long long long)
-USBD_ParseDescriptors(ptr long ptr long)
+@ stdcall USBD_Debug_GetHeap(long long long long)
+@ stdcall USBD_Debug_RetHeap(ptr long long)
+@ stdcall USBD_CalculateUsbBandwidth(long long long)
+@ stdcall USBD_CreateConfigurationRequestEx(ptr ptr)
+@ stdcall USBD_CreateConfigurationRequest(ptr ptr)
+@ stdcall USBD_GetInterfaceLength(ptr ptr)
+@ stdcall USBD_ParseConfigurationDescriptorEx(ptr ptr long long long long long)
+@ stdcall USBD_ParseDescriptors(ptr long ptr long)
 ;USBD_GetPdoRegistryParameters