diff --git a/application.c b/application.c
index 7360f8e..a0cd100 100644
--- a/application.c
+++ b/application.c
@@ -430,7 +430,7 @@ static void command_version(void* argument)
 static void command_uptime(void* argument)
 {
 	(void)argument; // we won't use the argument
-	uint32_t uptime = (rtc_get_counter_val() - time_start) / RTC_TICKS_SECOND; // get time from internal RTC
+	const uint32_t uptime = (rtc_get_counter_val() - time_start) / RTC_TICKS_SECOND; // get time from internal RTC
 	printf("uptime: %u.%02u:%02u:%02u\n", uptime / (24 * 60 * 60), (uptime / (60 * 60)) % 24, (uptime / 60) % 60, uptime % 60);
 }