diff --git a/boards/OLIMEX_STM32_103STK/board.h b/boards/OLIMEX_STM32_103STK/board.h
index e8fd9e7dc..2e56ceac3 100644
--- a/boards/OLIMEX_STM32_103STK/board.h
+++ b/boards/OLIMEX_STM32_103STK/board.h
@@ -149,6 +149,16 @@
 #define VAL_GPIOECRH            0x88888888      /* PE15...PE8 */
 #define VAL_GPIOEODR            0xFFFFFFFF
 
+/*
+ * USB bus activation macro, required by the USB driver.
+ */
+#define usb_lld_connect_bus(usbp) palClearPad(GPIOC, GPIOC_USB_DISC)
+
+/*
+ * USB bus de-activation macro, required by the USB driver.
+ */
+#define usb_lld_disconnect_bus(usbp) palSetPad(GPIOC, GPIOC_USB_DISC)
+
 #if !defined(_FROM_ASM_)
 #ifdef __cplusplus
 extern "C" {