diff --git a/channels/urbdrc/client/libusb/libusb_udevice.c b/channels/urbdrc/client/libusb/libusb_udevice.c
index 814540756..56809fe45 100644
--- a/channels/urbdrc/client/libusb/libusb_udevice.c
+++ b/channels/urbdrc/client/libusb/libusb_udevice.c
@@ -232,7 +232,7 @@ static void async_transfer_user_data_free(ASYNC_TRANSFER_USER_DATA* user_data)
 	}
 }
 
-static void func_iso_callback(struct libusb_transfer* transfer)
+static void LIBUSB_CALL func_iso_callback(struct libusb_transfer* transfer)
 {
 	ASYNC_TRANSFER_USER_DATA* user_data = (ASYNC_TRANSFER_USER_DATA*)transfer->user_data;
 	const UINT32 streamID = stream_id_from_buffer(transfer);
@@ -331,7 +331,7 @@ static const LIBUSB_ENDPOINT_DESCEIPTOR* func_get_ep_desc(LIBUSB_CONFIG_DESCRIPT
 	return NULL;
 }
 
-static void func_bulk_transfer_cb(struct libusb_transfer* transfer)
+static void LIBUSB_CALL func_bulk_transfer_cb(struct libusb_transfer* transfer)
 {
 	ASYNC_TRANSFER_USER_DATA* user_data;
 	uint32_t streamID;
diff --git a/channels/urbdrc/client/libusb/libusb_udevman.c b/channels/urbdrc/client/libusb/libusb_udevman.c
index 1638b8c13..b1440f300 100644
--- a/channels/urbdrc/client/libusb/libusb_udevman.c
+++ b/channels/urbdrc/client/libusb/libusb_udevman.c
@@ -580,7 +580,7 @@ static BOOL device_is_filtered(struct libusb_device* dev,
 	return filtered;
 }
 
-static int hotplug_callback(struct libusb_context* ctx, struct libusb_device* dev,
+static int LIBUSB_CALL hotplug_callback(struct libusb_context* ctx, struct libusb_device* dev,
                             libusb_hotplug_event event, void* user_data)
 {
 	VID_PID_PAIR pair;
@@ -859,7 +859,7 @@ static BOOL poll_libusb_events(UDEVMAN* udevman)
 	return rc > 0;
 }
 
-static DWORD poll_thread(LPVOID lpThreadParameter)
+static DWORD __stdcall poll_thread(LPVOID lpThreadParameter)
 {
 	libusb_hotplug_callback_handle handle;
 	UDEVMAN* udevman = (UDEVMAN*)lpThreadParameter;