diff --git a/boot/zephyr/main.c b/boot/zephyr/main.c
index 0efc5a80..d05939ea 100644
--- a/boot/zephyr/main.c
+++ b/boot/zephyr/main.c
@@ -324,7 +324,7 @@ void main(void)
 
 #ifdef CONFIG_MCUBOOT_SERIAL
 
-    struct device *detect_port;
+    struct device const *detect_port;
     uint32_t detect_value = !CONFIG_BOOT_SERIAL_DETECT_PIN_VAL;
 
     detect_port = device_get_binding(CONFIG_BOOT_SERIAL_DETECT_PORT);
diff --git a/boot/zephyr/serial_adapter.c b/boot/zephyr/serial_adapter.c
index 8787780e..82975228 100644
--- a/boot/zephyr/serial_adapter.c
+++ b/boot/zephyr/serial_adapter.c
@@ -41,7 +41,7 @@ struct line_input {
 	char line[CONFIG_BOOT_MAX_LINE_INPUT_LEN];
 };
 
-static struct device *uart_dev;
+static struct device const *uart_dev;
 static struct line_input line_bufs[2];
 
 static sys_slist_t avail_queue;
@@ -115,7 +115,7 @@ boot_console_init(void)
 }
 
 static void
-boot_uart_fifo_callback(struct device *dev, void *user_data)
+boot_uart_fifo_callback(const struct device *dev, void *user_data)
 {
 	static struct line_input *cmd;
 	uint8_t byte;