diff --git a/examples/stm32/f1/stm32-maple/miniblink/miniblink.c b/examples/stm32/f1/stm32-maple/miniblink/miniblink.c
index e5b9e43f..0d5d66c4 100644
--- a/examples/stm32/f1/stm32-maple/miniblink/miniblink.c
+++ b/examples/stm32/f1/stm32-maple/miniblink/miniblink.c
@@ -20,7 +20,7 @@
 #include <libopencm3/stm32/f1/rcc.h>
 #include <libopencm3/stm32/f1/gpio.h>
 
-void gpio_setup(void)
+static void gpio_setup(void)
 {
 	/* Enable GPIOA clock. */
 	/* Manually: */
diff --git a/examples/stm32/f1/stm32-maple/usart/usart.c b/examples/stm32/f1/stm32-maple/usart/usart.c
index 0b7991a7..75d120a1 100644
--- a/examples/stm32/f1/stm32-maple/usart/usart.c
+++ b/examples/stm32/f1/stm32-maple/usart/usart.c
@@ -21,7 +21,7 @@
 #include <libopencm3/stm32/f1/gpio.h>
 #include <libopencm3/stm32/usart.h>
 
-void clock_setup(void)
+static void clock_setup(void)
 {
 	rcc_clock_setup_in_hse_8mhz_out_72mhz();
 
@@ -32,7 +32,7 @@ void clock_setup(void)
 	rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USART2EN);
 }
 
-void usart_setup(void)
+static void usart_setup(void)
 {
 	/* Setup GPIO pin GPIO_USART2_TX. */
 	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
@@ -50,7 +50,7 @@ void usart_setup(void)
 	usart_enable(USART2);
 }
 
-void gpio_setup(void)
+static void gpio_setup(void)
 {
 	/* Set GPIO (in GPIO port A) to 'output push-pull'. */
 	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
diff --git a/examples/stm32/f1/stm32-maple/usart_irq/usart_irq.c b/examples/stm32/f1/stm32-maple/usart_irq/usart_irq.c
index bbb25150..43828380 100644
--- a/examples/stm32/f1/stm32-maple/usart_irq/usart_irq.c
+++ b/examples/stm32/f1/stm32-maple/usart_irq/usart_irq.c
@@ -23,7 +23,7 @@
 #include <libopencm3/cm3/nvic.h>
 #include <libopencm3/cm3/scb.h>
 
-void clock_setup(void)
+static void clock_setup(void)
 {
 	rcc_clock_setup_in_hse_8mhz_out_72mhz();
 
@@ -34,7 +34,7 @@ void clock_setup(void)
 	rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USART2EN);
 }
 
-void usart_setup(void)
+static void usart_setup(void)
 {
 	/* Enable the USART2 interrupt. */
 	nvic_enable_irq(NVIC_USART2_IRQ);
@@ -62,7 +62,7 @@ void usart_setup(void)
 	usart_enable(USART2);
 }
 
-void gpio_setup(void)
+static void gpio_setup(void)
 {
 	gpio_set(GPIOA, GPIO5);
 
diff --git a/examples/stm32/f1/stm32-maple/usb_cdcacm/cdcacm.c b/examples/stm32/f1/stm32-maple/usb_cdcacm/cdcacm.c
index 0e67961b..b0019c14 100644
--- a/examples/stm32/f1/stm32-maple/usb_cdcacm/cdcacm.c
+++ b/examples/stm32/f1/stm32-maple/usb_cdcacm/cdcacm.c
@@ -178,8 +178,8 @@ static int cdcacm_control_request(usbd_device *usbd_dev, struct usb_setup_data *
 		 * even though it's optional in the CDC spec, and we don't
 		 * advertise it in the ACM functional descriptor.
 		 */
-		char buf[10];
-		struct usb_cdc_notification *notif = (void *)buf;
+		char local_buf[10];
+		struct usb_cdc_notification *notif = (void *)local_buf;
 
 		/* We echo signals back to host as notification. */
 		notif->bmRequestType = 0xA1;
@@ -187,8 +187,8 @@ static int cdcacm_control_request(usbd_device *usbd_dev, struct usb_setup_data *
 		notif->wValue = 0;
 		notif->wIndex = 0;
 		notif->wLength = 2;
-		buf[8] = req->wValue & 3;
-		buf[9] = 0;
+		local_buf[8] = req->wValue & 3;
+		local_buf[9] = 0;
 		// usbd_ep_write_packet(0x83, buf, 10);
 		return 1;
 		}