diff --git a/Cargo.toml b/Cargo.toml
index 13724ae4..648ca11d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,3 +16,6 @@ members = [
 [profile.release]
 lto = true
 codegen-units = 1
+
+[profile.release.package.oxigraph_js]
+opt-level = "z"