diff --git a/cmd/zpios/zpios_main.c b/cmd/zpios/zpios_main.c
index d0e3f7b91..a413453e4 100644
--- a/cmd/zpios/zpios_main.c
+++ b/cmd/zpios/zpios_main.c
@@ -388,7 +388,7 @@ dev_clear(void)
 		fprintf(stderr, "Ioctl() error %lu / %d: %d\n",
 		    (unsigned long) ZPIOS_CFG, cfg.cfg_cmd, errno);
 
-	lseek(zpiosctl_fd, 0, SEEK_SET);
+	(void) lseek(zpiosctl_fd, 0, SEEK_SET);
 
 	return (rc);
 }
diff --git a/cmd/zpool/zpool_vdev.c b/cmd/zpool/zpool_vdev.c
index b51b9c9c3..b0db5e873 100644
--- a/cmd/zpool/zpool_vdev.c
+++ b/cmd/zpool/zpool_vdev.c
@@ -735,7 +735,7 @@ make_leaf_vdev(nvlist_t *props, const char *arg, uint64_t is_log)
 	}
 
 	if (ashift > 0)
-		nvlist_add_uint64(vdev, ZPOOL_CONFIG_ASHIFT, ashift);
+		(void) nvlist_add_uint64(vdev, ZPOOL_CONFIG_ASHIFT, ashift);
 
 	return (vdev);
 }
diff --git a/lib/libzfs/libzfs_pool.c b/lib/libzfs/libzfs_pool.c
index a37ea7913..f515419b1 100644
--- a/lib/libzfs/libzfs_pool.c
+++ b/lib/libzfs/libzfs_pool.c
@@ -3468,7 +3468,7 @@ zpool_vdev_name(libzfs_handle_t *hdl, zpool_handle_t *zhp, nvlist_t *nv,
 
 	if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, &value) == 0 ||
 	    name_flags & VDEV_NAME_GUID) {
-		nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &value);
+		(void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &value);
 		(void) snprintf(buf, sizeof (buf), "%llu", (u_longlong_t)value);
 		path = buf;
 	} else if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) == 0) {
diff --git a/module/zfs/fm.c b/module/zfs/fm.c
index 2a425a740..a1069d140 100644
--- a/module/zfs/fm.c
+++ b/module/zfs/fm.c
@@ -652,7 +652,7 @@ zfs_zevent_next(zfs_zevent_t *ze, nvlist_t **event, uint64_t *event_size,
 
 	ze->ze_zevent = ev;
 	list_insert_head(&ev->ev_ze_list, ze);
-	nvlist_dup(ev->ev_nvl, event, KM_SLEEP);
+	(void) nvlist_dup(ev->ev_nvl, event, KM_SLEEP);
 	*dropped = ze->ze_dropped;
 	ze->ze_dropped = 0;
 out:
diff --git a/module/zfs/zfs_znode.c b/module/zfs/zfs_znode.c
index 12dada4fc..647ce48dc 100644
--- a/module/zfs/zfs_znode.c
+++ b/module/zfs/zfs_znode.c
@@ -456,7 +456,7 @@ zfs_inode_set_ops(zfs_sb_t *zsb, struct inode *ip)
 	 */
 	case S_IFCHR:
 	case S_IFBLK:
-		sa_lookup(ITOZ(ip)->z_sa_hdl, SA_ZPL_RDEV(zsb), &rdev,
+		(void) sa_lookup(ITOZ(ip)->z_sa_hdl, SA_ZPL_RDEV(zsb), &rdev,
 		    sizeof (rdev));
 		/*FALLTHROUGH*/
 	case S_IFIFO: