diff --git a/zcash-client-backend-wasm/Cargo.toml b/zcash-client-backend-wasm/Cargo.toml
index 9493e9a..1755140 100644
--- a/zcash-client-backend-wasm/Cargo.toml
+++ b/zcash-client-backend-wasm/Cargo.toml
@@ -68,4 +68,4 @@ wasm-bindgen-test = "0.2"
 
 [profile.release]
 # Tell `rustc` to optimize for small code size.
-opt-level = "s"
+# opt-level = "s"