diff --git a/src/rtc.c b/src/rtc.c
--- a/src/rtc.c
+++ b/src/rtc.c
@@ -10,7 +10,7 @@ RTC_HandleTypeDef hrtc;
 
 static void Error_Handler(void)
 {
-	volatile crap = 1;
+	volatile uint8_t crap = 1;
 }
 
 // Initialize RTC