diff --git a/usr.sbin/fifolog/lib/fifolog_create.c b/usr.sbin/fifolog/lib/fifolog_create.c
index 2a966e2080f1..4a7c3338ad37 100644
--- a/usr.sbin/fifolog/lib/fifolog_create.c
+++ b/usr.sbin/fifolog/lib/fifolog_create.c
@@ -44,7 +44,7 @@ const char *
 fifolog_create(const char *fn, off_t size, ssize_t recsize)
 {
 	int i, fd;
-	unsigned u;
+	ssize_t u;
 	off_t ms;
 	struct stat st;
 	char *buf;
diff --git a/usr.sbin/fifolog/lib/fifolog_write_poll.c b/usr.sbin/fifolog/lib/fifolog_write_poll.c
index 0c0b0fb62d4f..9ebd5beee23d 100644
--- a/usr.sbin/fifolog/lib/fifolog_write_poll.c
+++ b/usr.sbin/fifolog/lib/fifolog_write_poll.c
@@ -318,7 +318,7 @@ fifolog_write_record(struct fifolog_writer *f, uint32_t id, time_t now,
 {
 	const unsigned char *p;
 	uint8_t buf[9];
-	unsigned bufl;
+	ssize_t bufl;
 
 	fifolog_write_assert(f);
 	assert(!(id & (FIFOLOG_TIMESTAMP|FIFOLOG_LENGTH)));