diff --git a/module/zfs/zfs_crrd.c b/module/zfs/zfs_crrd.c
index f9267ed41..e5783b7b8 100644
--- a/module/zfs/zfs_crrd.c
+++ b/module/zfs/zfs_crrd.c
@@ -208,7 +208,8 @@ dbrrd_closest(hrtime_t tv, const rrd_data_t *r1, const rrd_data_t *r2)
 	if (r2 == NULL)
 		return (r1);
 
-	return (ABS(tv - r1->rrdd_time) < ABS(tv - r2->rrdd_time) ? r1 : r2);
+	return (ABS(tv - (hrtime_t)r1->rrdd_time) <
+	    ABS(tv - (hrtime_t)r2->rrdd_time) ? r1 : r2);
 }
 
 uint64_t