diff --git a/src/bootloader/usbdfu.c b/src/bootloader/usbdfu.c
index 67d3218..a84ebd6 100644
--- a/src/bootloader/usbdfu.c
+++ b/src/bootloader/usbdfu.c
@@ -244,6 +244,15 @@ static usbd_device *usb_init(void)
 	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL,
 		      GPIO11 | GPIO12);
 	gpio_clear(GPIOA, GPIO11 || GPIO12);
+
+#ifdef USE_MAPLEMINI
+	/* add support for Maplemini board */
+	rcc_periph_clock_enable(RCC_GPIOB);
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL,
+		      GPIO9);
+	gpio_clear(GPIOB, GPIO9);
+#endif
+
 	t = time_now() + 10000;
 	while (cyclecmp32(time_now(), t) < 0)
 		;
diff --git a/src/i2c-stm32f1-usb/i2c-stm32f1-usb.c b/src/i2c-stm32f1-usb/i2c-stm32f1-usb.c
index 07a33d0..bd7b2b0 100644
--- a/src/i2c-stm32f1-usb/i2c-stm32f1-usb.c
+++ b/src/i2c-stm32f1-usb/i2c-stm32f1-usb.c
@@ -328,6 +328,15 @@ static int usb_fibre(fibre_t *fibre)
 	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL,
 		      GPIO11 | GPIO12);
 	gpio_clear(GPIOA, GPIO11 | GPIO12);
+
+#ifdef USE_MAPLEMINI
+	/* add support for Maplemini board */
+	rcc_periph_clock_enable(RCC_GPIOB);
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL,
+		      GPIO9);
+	gpio_clear(GPIOB, GPIO9);
+#endif
+
 	t = time_now() + 10000;
 	PT_WAIT_UNTIL(fibre_timeout(t));