diff --git a/cmd/zdb/zdb.c b/cmd/zdb/zdb.c
index 92df3dd16..a3a363ca5 100644
--- a/cmd/zdb/zdb.c
+++ b/cmd/zdb/zdb.c
@@ -6203,10 +6203,10 @@ zdb_check_for_obsolete_leaks(vdev_t *vd, zdb_cb_t *zcb)
 		 */
 		for (uint64_t inner_offset = 0;
 		    inner_offset < DVA_GET_ASIZE(&vimep->vimep_dst);
-		    inner_offset += 1 << vd->vdev_ashift) {
+		    inner_offset += 1ULL << vd->vdev_ashift) {
 			if (range_tree_contains(msp->ms_allocatable,
-			    offset + inner_offset, 1 << vd->vdev_ashift)) {
-				obsolete_bytes += 1 << vd->vdev_ashift;
+			    offset + inner_offset, 1ULL << vd->vdev_ashift)) {
+				obsolete_bytes += 1ULL << vd->vdev_ashift;
 			}
 		}
 
diff --git a/module/zfs/dsl_scan.c b/module/zfs/dsl_scan.c
index 28afc3dea..5ad8ff1f3 100644
--- a/module/zfs/dsl_scan.c
+++ b/module/zfs/dsl_scan.c
@@ -3000,7 +3000,7 @@ scan_io_queue_fetch_ext(dsl_scan_io_queue_t *queue)
 	 * otherwise we leave shorter remnant every txg.
 	 */
 	uint64_t start;
-	uint64_t size = 1 << rt->rt_shift;
+	uint64_t size = 1ULL << rt->rt_shift;
 	range_seg_t *addr_rs;
 	if (queue->q_last_ext_addr != -1) {
 		start = queue->q_last_ext_addr;
diff --git a/module/zfs/metaslab.c b/module/zfs/metaslab.c
index 02cf121d8..4234f8ebf 100644
--- a/module/zfs/metaslab.c
+++ b/module/zfs/metaslab.c
@@ -1449,7 +1449,7 @@ metaslab_rt_add(range_tree_t *rt, range_seg_t *rs, void *arg)
 	zfs_btree_t *size_tree = mrap->mra_bt;
 
 	if (rs_get_end(rs, rt) - rs_get_start(rs, rt) <
-	    (1 << mrap->mra_floor_shift))
+	    (1ULL << mrap->mra_floor_shift))
 		return;
 
 	zfs_btree_add(size_tree, rs);
@@ -1461,7 +1461,7 @@ metaslab_rt_remove(range_tree_t *rt, range_seg_t *rs, void *arg)
 	metaslab_rt_arg_t *mrap = arg;
 	zfs_btree_t *size_tree = mrap->mra_bt;
 
-	if (rs_get_end(rs, rt) - rs_get_start(rs, rt) < (1 <<
+	if (rs_get_end(rs, rt) - rs_get_start(rs, rt) < (1ULL <<
 	    mrap->mra_floor_shift))
 		return;
 
@@ -3552,7 +3552,7 @@ metaslab_should_condense(metaslab_t *msp)
 {
 	space_map_t *sm = msp->ms_sm;
 	vdev_t *vd = msp->ms_group->mg_vd;
-	uint64_t vdev_blocksize = 1 << vd->vdev_ashift;
+	uint64_t vdev_blocksize = 1ULL << vd->vdev_ashift;
 
 	ASSERT(MUTEX_HELD(&msp->ms_lock));
 	ASSERT(msp->ms_loaded);