diff --git a/nix/build-all.py b/nix/build-all.py
index 286c12f865..4571d32dd6 100644
--- a/nix/build-all.py
+++ b/nix/build-all.py
@@ -763,6 +763,7 @@ OFF_ON = ["OFF", "ON"]
 
 cmake_args = [
     "-DUSE_MMAP="                      "OFF",
+    "-DSCHEMA_VERSIONS="               "4x3_add2",
     "-DBUILD_EXAMPLES="                "OFF",
     "-DBUILD_SHARED_LIBS="             +OFF_ON[not BUILD_STATIC],
     "-DBOOST_ROOT="                    f"{DEPS_DIR}/install/boost-{BOOST_VERSION}",
diff --git a/src/ifcgeom/taxonomy.h b/src/ifcgeom/taxonomy.h
index eae30e1069..4f12d81920 100644
--- a/src/ifcgeom/taxonomy.h
+++ b/src/ifcgeom/taxonomy.h
@@ -1264,7 +1264,7 @@ typedef item const* ptr;
 		// @nb traverses nested collections
 		template <typename Fn>
 		taxonomy::collection::ptr filter_in_place(taxonomy::collection::ptr collection, Fn fn) {
-			const auto& c = collection->children;
+			auto& c = collection->children;
 			auto new_end = std::remove_if(c.begin(), c.end(), [fn](taxonomy::geom_item::ptr i) {
 				return !apply_predicate_to_collection(i, fn);
 			});