diff --git a/packages/wasm-crypto/Cargo.toml b/packages/wasm-crypto/Cargo.toml
index 05d41f79..2ff1fbc4 100644
--- a/packages/wasm-crypto/Cargo.toml
+++ b/packages/wasm-crypto/Cargo.toml
@@ -36,3 +36,4 @@ rand = { version = "0.6.5", features = ["wasm-bindgen"] }
 
 [profile.release]
 lto = true
+opt-level = "s"