diff --git a/src/stm32/stm32f1.c b/src/stm32/stm32f1.c
index e5defd96..e1ef56aa 100644
--- a/src/stm32/stm32f1.c
+++ b/src/stm32/stm32f1.c
@@ -5,6 +5,8 @@
 // This file may be distributed under the terms of the GNU GPLv3 license.
 
 #include "autoconf.h" // CONFIG_CLOCK_REF_8M
+#include "board/irq.h" // irq_disable
+#include "board/usb_cdc.h" // usb_request_bootloader
 #include "internal.h" // enable_pclock
 
 #define FREQ_PERIPH (CONFIG_CLOCK_FREQ / 2)
@@ -104,6 +106,21 @@ gpio_peripheral(uint32_t gpio, uint32_t mode, int pullup)
         AFIO->MAPR = AFIO_MAPR_SWJ_CFG_DISABLE;
 }
 
+// Handle USB reboot requests
+void
+usb_request_bootloader(void)
+{
+    if (!CONFIG_STM32_FLASH_START_2000)
+        return;
+    // Enter "stm32duino" bootloader
+    irq_disable();
+    RCC->APB1ENR |= RCC_APB1ENR_PWREN | RCC_APB1ENR_BKPEN;
+    PWR->CR |= PWR_CR_DBP;
+    BKP->DR10 = 0x01;
+    PWR->CR &=~ PWR_CR_DBP;
+    NVIC_SystemReset();
+}
+
 // Main clock setup called at chip startup
 void
 clock_setup(void)
diff --git a/src/stm32/stm32f4.c b/src/stm32/stm32f4.c
index 9d40f34c..e6f3f14d 100644
--- a/src/stm32/stm32f4.c
+++ b/src/stm32/stm32f4.c
@@ -5,6 +5,7 @@
 // This file may be distributed under the terms of the GNU GPLv3 license.
 
 #include "autoconf.h" // CONFIG_CLOCK_REF_8M
+#include "board/usb_cdc.h" // usb_request_bootloader
 #include "command.h" // DECL_CONSTANT_STR
 #include "internal.h" // enable_pclock
 
@@ -85,6 +86,12 @@ gpio_peripheral(uint32_t gpio, uint32_t mode, int pullup)
     regs->OSPEEDR = (regs->OSPEEDR & ~m_msk) | (0x02 << m_shift);
 }
 
+// Handle USB reboot requests
+void
+usb_request_bootloader(void)
+{
+}
+
 #if CONFIG_CLOCK_REF_8M
 DECL_CONSTANT_STR("RESERVE_PINS_crystal", "PH0,PH1");
 #endif
diff --git a/src/stm32/usbfs.c b/src/stm32/usbfs.c
index de80b9ae..a7a20548 100644
--- a/src/stm32/usbfs.c
+++ b/src/stm32/usbfs.c
@@ -10,7 +10,6 @@
 #include "board/armcm_timer.h" // udelay
 #include "board/gpio.h" // gpio_out_setup
 #include "board/io.h" // writeb
-#include "board/irq.h" // irq_disable
 #include "board/usb_cdc.h" // usb_notify_ep0
 #include "board/usb_cdc_ep.h" // USB_CDC_EP_BULK_IN
 #include "command.h" // DECL_CONSTANT_STR
@@ -207,20 +206,6 @@ usb_set_configure(void)
 {
 }
 
-void
-usb_request_bootloader(void)
-{
-    if (!CONFIG_STM32_FLASH_START_2000)
-        return;
-    // Enter "stm32duino" bootloader
-    irq_disable();
-    RCC->APB1ENR |= RCC_APB1ENR_PWREN | RCC_APB1ENR_BKPEN;
-    PWR->CR |= PWR_CR_DBP;
-    BKP->DR10 = 0x01;
-    PWR->CR &=~ PWR_CR_DBP;
-    NVIC_SystemReset();
-}
-
 
 /****************************************************************
  * Setup and interrupts
diff --git a/src/stm32/usbotg.c b/src/stm32/usbotg.c
index 1fbacb3d..99b9cc3a 100644
--- a/src/stm32/usbotg.c
+++ b/src/stm32/usbotg.c
@@ -338,11 +338,6 @@ usb_set_configure(void)
     usb_irq_enable();
 }
 
-void
-usb_request_bootloader(void)
-{
-}
-
 
 /****************************************************************
  * Setup and interrupts