diff --git a/fio-io.c b/fio-io.c
index 46cd11a..3f55a19 100644
--- a/fio-io.c
+++ b/fio-io.c
@@ -461,7 +461,7 @@
 #ifdef FIO_HAVE_SGIO
 
 struct sgio_cmd {
-	char cdb[10];
+	unsigned char cdb[10];
 	int nr;
 };
 
@@ -497,7 +497,7 @@
 	struct sgio_data *sd = td->io_data;
 	struct pollfd pfd = { .fd = td->fd, .events = POLLIN };
 	void *buf = malloc(max * sizeof(struct sg_io_hdr));
-	int left = max, ret, events, i, r = 0, fl;
+	int left = max, ret, events, i, r = 0, fl = 0;
 
 	/*
 	 * don't block for !events