diff --git a/drivers/serial/sandbox.c b/drivers/serial/sandbox.c index cae6c9411c..814a0f9e7f 100644 --- a/drivers/serial/sandbox.c +++ b/drivers/serial/sandbox.c @@ -50,7 +50,7 @@ void serial_puts(const char *str) int serial_getc(void) { char buf; - int count; + ssize_t count; count = os_read(0, &buf, 1); return count == 1 ? buf : 0;