diff --git a/src/crimson/os/seastore/collection_manager/flat_collection_manager.cc b/src/crimson/os/seastore/collection_manager/flat_collection_manager.cc
index b6591bbc02a..08cf84ffa33 100644
--- a/src/crimson/os/seastore/collection_manager/flat_collection_manager.cc
+++ b/src/crimson/os/seastore/collection_manager/flat_collection_manager.cc
@@ -19,7 +19,7 @@ namespace {
 namespace crimson::os::seastore::collection_manager {
 
 constexpr static segment_off_t MIN_FLAT_BLOCK_SIZE = 4<<10;
-constexpr static segment_off_t MAX_FLAT_BLOCK_SIZE = 4<<20;
+[[maybe_unused]] constexpr static segment_off_t MAX_FLAT_BLOCK_SIZE = 4<<20;
 
 FlatCollectionManager::FlatCollectionManager(
   TransactionManager &tm)
diff --git a/src/crimson/os/seastore/omap_manager/btree/omap_btree_node_impl.cc b/src/crimson/os/seastore/omap_manager/btree/omap_btree_node_impl.cc
index e1ad0192602..acade8e43a3 100644
--- a/src/crimson/os/seastore/omap_manager/btree/omap_btree_node_impl.cc
+++ b/src/crimson/os/seastore/omap_manager/btree/omap_btree_node_impl.cc
@@ -235,6 +235,7 @@ OMapInnerNode::list(
 		child_result.begin(),
 		child_result.end());
 	      biter++;
+	      (void)max_result_size;
 	      assert(child_complete || result.size() == max_result_size);
 	      return list_ertr::make_ready_future<bool>(false);
 	    });