diff --git a/Monitor.c b/Monitor.c
index f19c2e5..6df80f9 100644
--- a/Monitor.c
+++ b/Monitor.c
@@ -33,7 +33,7 @@
 struct state {
 	char *devname;
 	char devnm[32];	/* to sync with mdstat info */
-	long utime;
+	unsigned int utime;
 	int err;
 	char *spare_group;
 	int active, working, failed, spare, raid;
diff --git a/util.c b/util.c
index 970d484..6e7d3fb 100644
--- a/util.c
+++ b/util.c
@@ -1267,7 +1267,7 @@ struct supertype *guess_super_type(int fd, enum guess_types guess_type)
 	 */
 	struct superswitch  *ss;
 	struct supertype *st;
-	time_t besttime = 0;
+	unsigned int besttime = 0;
 	int bestsuper = -1;
 	int i;