diff --git a/main.c b/main.c
--- a/main.c
+++ b/main.c
@@ -44,6 +44,9 @@ int main(void)
     /* Configure the system clock */
     SystemClock_Config();
 
+    /* Unset bootloader option bytes (if set) */
+    void bootloader_unset(void);
+
     /* Initialize all configured peripherals */
     init_gpio();
     MX_USB_DEVICE_Init();