diff --git a/reactos/drivers/usb/usbuhci/hardware.cpp b/reactos/drivers/usb/usbuhci/hardware.cpp
index daa4eb29144..8b195529d75 100644
--- a/reactos/drivers/usb/usbuhci/hardware.cpp
+++ b/reactos/drivers/usb/usbuhci/hardware.cpp
@@ -1487,6 +1487,7 @@ StatusChangeWorkItemRoutine(
 }
 
 NTSTATUS
+NTAPI
 CreateUSBHardware(
     PUSBHARDWAREDEVICE *OutHardware)
 {
diff --git a/reactos/drivers/usb/usbuhci/usb_queue.cpp b/reactos/drivers/usb/usbuhci/usb_queue.cpp
index 6c7beb4c856..eeef1724557 100644
--- a/reactos/drivers/usb/usbuhci/usb_queue.cpp
+++ b/reactos/drivers/usb/usbuhci/usb_queue.cpp
@@ -518,6 +518,7 @@ CUSBQueue::TransferInterrupt(
 }
 
 NTSTATUS
+NTAPI
 CreateUSBQueue(
     PUSBQUEUE *OutUsbQueue)
 {
diff --git a/reactos/drivers/usb/usbuhci/usb_request.cpp b/reactos/drivers/usb/usbuhci/usb_request.cpp
index 9125336d5d5..df40ae7accf 100644
--- a/reactos/drivers/usb/usbuhci/usb_request.cpp
+++ b/reactos/drivers/usb/usbuhci/usb_request.cpp
@@ -1385,6 +1385,7 @@ CUSBRequest::CompletionCallback()
 
 //-----------------------------------------------------------------------------------------
 NTSTATUS
+NTAPI
 InternalCreateUSBRequest(
     PUSBREQUEST *OutRequest)
 {
diff --git a/reactos/drivers/usb/usbuhci/usbuhci.h b/reactos/drivers/usb/usbuhci/usbuhci.h
index c4e131dde8b..fe7ec80cfb2 100644
--- a/reactos/drivers/usb/usbuhci/usbuhci.h
+++ b/reactos/drivers/usb/usbuhci/usbuhci.h
@@ -61,16 +61,16 @@ extern
 //
 // hardware.cpp
 //
-NTSTATUS CreateUSBHardware(PUSBHARDWAREDEVICE *OutHardware);
+NTSTATUS NTAPI CreateUSBHardware(PUSBHARDWAREDEVICE *OutHardware);
 
 //
 // usb_queue.cpp
 //
-NTSTATUS CreateUSBQueue(PUSBQUEUE *OutUsbQueue);
+NTSTATUS NTAPI CreateUSBQueue(PUSBQUEUE *OutUsbQueue);
 
 //
 // usb_request.cpp
 //
-NTSTATUS InternalCreateUSBRequest(PUSBREQUEST *OutRequest);
+NTSTATUS NTAPI InternalCreateUSBRequest(PUSBREQUEST *OutRequest);
 
 #endif