diff --git a/ChangeLog b/ChangeLog
index c08b645..4d0b53e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2017-11-15  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* mcu/usb-stm32f103.c (usb_lld_init): Enable USB wake up
+	by EXTI.
+
 2017-11-15  NIIBE Yutaka  <gniibe@fsij.org>
 
 	* chopstx.c (chopstx_conf_idle): Call chx_sleep_mode.
diff --git a/entry.c b/entry.c
index 29d520d..21225de 100644
--- a/entry.c
+++ b/entry.c
@@ -205,23 +205,23 @@ handler vector_table[] __attribute__ ((section(".startup.vectors"))) = {
   preempt,			/* PendSV */
   chx_timer_expired,		/* SysTick */
   /* 0x40 */
-  chx_handle_intr /* WWDG */,     chx_handle_intr /* PVD */,
-  chx_handle_intr /* TAMPER */,   chx_handle_intr /* RTC */,
-  chx_handle_intr /* FLASH */,    chx_handle_intr /* RCC */,
-  chx_handle_intr /* EXTI0 */,    chx_handle_intr /* EXTI1 */,
+  chx_handle_intr /* WWDG */,      chx_handle_intr /* PVD */,
+  chx_handle_intr /* TAMPER */,    chx_handle_intr /* RTC */,
+  chx_handle_intr /* FLASH */,     chx_handle_intr /* RCC */,
+  chx_handle_intr /* EXTI0 */,     chx_handle_intr /* EXTI1 */,
   /* 0x60 */
-  chx_handle_intr /* EXTI2 */,    chx_handle_intr /* EXTI3 */,
-  chx_handle_intr /* EXTI4 */,    chx_handle_intr /* DMA1 CH1 */,
-  chx_handle_intr /* DMA1 CH2 */, chx_handle_intr /* DMA1 CH3 */,
-  chx_handle_intr /* DMA1 CH4 */, chx_handle_intr /* DMA1 CH5 */,
+  chx_handle_intr /* EXTI2 */,     chx_handle_intr /* EXTI3 */,
+  chx_handle_intr /* EXTI4 */,     chx_handle_intr /* DMA1 CH1 */,
+  chx_handle_intr /* DMA1 CH2 */,  chx_handle_intr /* DMA1 CH3 */,
+  chx_handle_intr /* DMA1 CH4 */,  chx_handle_intr /* DMA1 CH5 */,
   /* 0x80 */
-  chx_handle_intr /* DMA1 CH6 */, chx_handle_intr /* DMA1 CH7 */,
-  chx_handle_intr /* ADC1_2 */,   chx_handle_intr /* USB HP */,
+  chx_handle_intr /* DMA1 CH6 */,  chx_handle_intr /* DMA1 CH7 */,
+  chx_handle_intr /* ADC1_2 */,    chx_handle_intr /* USB HP */,
   /* 0x90 */
-  chx_handle_intr /* USB LP */,   chx_handle_intr /* CAN */,
-  /* ... and more.  EXT9_5, TIMx, I2C, SPI, USART, EXT15_10 */
-  chx_handle_intr,                chx_handle_intr,
-  /* 0xA0 */
+  chx_handle_intr /* USB LP */,    chx_handle_intr /* CAN RX1 */,
+  chx_handle_intr /* CAN SCE */,   chx_handle_intr /* EXT9_5 */,
+  /* 0xa0 */
+  /* ... and more.  TIMx, I2C, SPI, USART... */
   chx_handle_intr,  chx_handle_intr,  chx_handle_intr,  chx_handle_intr,
   chx_handle_intr,  chx_handle_intr,  chx_handle_intr,  chx_handle_intr,
   /* 0xc0 */
@@ -229,15 +229,16 @@ handler vector_table[] __attribute__ ((section(".startup.vectors"))) = {
   /* STM32F0 doesn't have more.  */
   chx_handle_intr,  chx_handle_intr,  chx_handle_intr,  chx_handle_intr,
   chx_handle_intr,  chx_handle_intr,  chx_handle_intr,  chx_handle_intr,
-  chx_handle_intr,  chx_handle_intr,  chx_handle_intr,
+  /* 0xe0 */
+  chx_handle_intr /* EXT15_10 */,  chx_handle_intr /* RTCAlarm */,
+  chx_handle_intr /* USBWakeup */, chx_handle_intr,
 #endif
 #if !defined(STM32F10X_MD)
-  /* High-density chips have more; RTCAlarm, USBWakeup, ... , DMA2_Channel4_5 */
+  /* High-density chips have more; ... DMA2_Channel4_5 */
   chx_handle_intr,  chx_handle_intr,  chx_handle_intr,  chx_handle_intr,
   chx_handle_intr,  chx_handle_intr,  chx_handle_intr,  chx_handle_intr,
   chx_handle_intr,  chx_handle_intr,  chx_handle_intr,  chx_handle_intr,
   chx_handle_intr,  chx_handle_intr,  chx_handle_intr,  chx_handle_intr,
-  chx_handle_intr,  chx_handle_intr,  chx_handle_intr,
 #endif
 };
 #endif
diff --git a/mcu/usb-stm32f103.c b/mcu/usb-stm32f103.c
index 648b525..6a8fddf 100644
--- a/mcu/usb-stm32f103.c
+++ b/mcu/usb-stm32f103.c
@@ -1,7 +1,7 @@
 /*
  * usb-stm32f103.c - USB driver for STM32F103
  *
- * Copyright (C) 2016  Flying Stone Technology
+ * Copyright (C) 2016, 2017  Flying Stone Technology
  * Author: NIIBE Yutaka <gniibe@fsij.org>
  *
  * This file is a part of Chopstx, a thread library for embedded.
@@ -29,6 +29,7 @@
 #include <stdint.h>
 #include <stdlib.h>
 
+#include "mcu/stm32f103.h"
 #include "sys-stm32f103.h"
 #include "usb_lld.h"
 #include "usb_lld_driver.h"
@@ -341,6 +342,11 @@ void usb_lld_init (struct usb_dev *dev, uint8_t feature)
   st103_set_istr (0);
   st103_set_cntr (CNTR_CTRM | CNTR_OVRM | CNTR_ERRM
 		  | CNTR_WKUPM | CNTR_SUSPM | CNTR_RESETM);
+
+  /* Setting of EXTI wakeup interrupt to break sleep mode.  */
+  EXTI->RTSR |= (1 << 18);	/* Rising trigger selection */
+  EXTI->PR   |= (1 << 18);	/* Clear pending bit */
+  EXTI->IMR  |= (1 << 18);	/* Interrupt mask disabled */
 }
 
 void usb_lld_prepare_shutdown (void)