diff --git a/include/spl/sys/time.h b/include/spl/sys/time.h
index 312415b7bc8..24c1ec7c7ae 100644
--- a/include/spl/sys/time.h
+++ b/include/spl/sys/time.h
@@ -85,7 +85,7 @@ gethrestime(inode_timespec_t *ts)
 #endif
 }
 
-static inline time_t
+static inline uint64_t
 gethrestime_sec(void)
 {
 #if defined(HAVE_INODE_TIMESPEC64_TIMES)
diff --git a/include/sys/vdev_impl.h b/include/sys/vdev_impl.h
index f6f7bbb4b28..090ba3fbc87 100644
--- a/include/sys/vdev_impl.h
+++ b/include/sys/vdev_impl.h
@@ -274,7 +274,7 @@ struct vdev {
 	range_tree_t	*vdev_initialize_tree;	/* valid while initializing */
 	uint64_t	vdev_initialize_bytes_est;
 	uint64_t	vdev_initialize_bytes_done;
-	time_t		vdev_initialize_action_time;	/* start and end time */
+	uint64_t	vdev_initialize_action_time;	/* start and end time */
 
 	/* TRIM related */
 	boolean_t	vdev_trim_exit_wanted;
@@ -295,7 +295,7 @@ struct vdev {
 	uint64_t	vdev_trim_rate;		/* requested rate (bytes/sec) */
 	uint64_t	vdev_trim_partial;	/* requested partial TRIM */
 	uint64_t	vdev_trim_secure;	/* requested secure TRIM */
-	time_t		vdev_trim_action_time;	/* start and end time */
+	uint64_t	vdev_trim_action_time;	/* start and end time */
 
 	/* for limiting outstanding I/Os (initialize and TRIM) */
 	kmutex_t	vdev_initialize_io_lock;
diff --git a/lib/libspl/include/sys/time.h b/lib/libspl/include/sys/time.h
index 291f2190a28..c9f6165047d 100644
--- a/lib/libspl/include/sys/time.h
+++ b/lib/libspl/include/sys/time.h
@@ -88,7 +88,7 @@ gethrestime(inode_timespec_t *ts)
 	ts->tv_nsec = tv.tv_usec * NSEC_PER_USEC;
 }
 
-static inline time_t
+static inline uint64_t
 gethrestime_sec(void)
 {
 	struct timeval tv;
diff --git a/module/zfs/vdev_initialize.c b/module/zfs/vdev_initialize.c
index 9958a295832..8a3635969e1 100644
--- a/module/zfs/vdev_initialize.c
+++ b/module/zfs/vdev_initialize.c
@@ -700,7 +700,7 @@ vdev_initialize_restart(vdev_t *vd)
 		    vd->vdev_leaf_zap, VDEV_LEAF_ZAP_INITIALIZE_ACTION_TIME,
 		    sizeof (timestamp), 1, &timestamp);
 		ASSERT(err == 0 || err == ENOENT);
-		vd->vdev_initialize_action_time = (time_t)timestamp;
+		vd->vdev_initialize_action_time = timestamp;
 
 		if (vd->vdev_initialize_state == VDEV_INITIALIZE_SUSPENDED ||
 		    vd->vdev_offline) {
diff --git a/module/zfs/vdev_trim.c b/module/zfs/vdev_trim.c
index 5ad47cccdaf..b7548fc4c18 100644
--- a/module/zfs/vdev_trim.c
+++ b/module/zfs/vdev_trim.c
@@ -1046,7 +1046,7 @@ vdev_trim_restart(vdev_t *vd)
 		    vd->vdev_leaf_zap, VDEV_LEAF_ZAP_TRIM_ACTION_TIME,
 		    sizeof (timestamp), 1, &timestamp);
 		ASSERT(err == 0 || err == ENOENT);
-		vd->vdev_trim_action_time = (time_t)timestamp;
+		vd->vdev_trim_action_time = timestamp;
 
 		if (vd->vdev_trim_state == VDEV_TRIM_SUSPENDED ||
 		    vd->vdev_offline) {
diff --git a/module/zfs/zfs_debug.c b/module/zfs/zfs_debug.c
index 538533d27d2..cf8bbb3ce4f 100644
--- a/module/zfs/zfs_debug.c
+++ b/module/zfs/zfs_debug.c
@@ -27,7 +27,7 @@
 
 typedef struct zfs_dbgmsg {
 	procfs_list_node_t	zdm_node;
-	time_t			zdm_timestamp;
+	uint64_t		zdm_timestamp;
 	int			zdm_size;
 	char			zdm_msg[1]; /* variable length allocation */
 } zfs_dbgmsg_t;