diff --git a/src/serial.c b/src/serial.c
index 507a7bc..4c46a9b 100644
--- a/src/serial.c
+++ b/src/serial.c
@@ -61,7 +61,8 @@ void USART_Print(bool state, const char *pre, const char *fmt, va_list ap)
 	int len;
 	char buf[256], *ptr;
 
-	len = sprintf(buf, "[CORE][%c] %s", state ? 'E' : 'D', pre);
+	UNUSED(state);
+	len = sprintf(buf, "[CORE] %s", pre); //, state ? 'E' : 'D', pre);
 	vsnprintf(buf + len, sizeof(buf) - len, fmt, ap);
 
 	ptr = buf;