diff --git a/lang/rust/Cargo.toml b/lang/rust/Cargo.toml
index 43872102f28..5e188c60d02 100644
--- a/lang/rust/Cargo.toml
+++ b/lang/rust/Cargo.toml
@@ -37,3 +37,7 @@ rust-version = "1.65.0"
 keywords = ["avro", "data", "serialization"]
 categories = ["encoding"]
 documentation = "https://docs.rs/apache-avro"
+
+[profile.release.package.hello-wasm]
+# Tell `rustc` to optimize for small code size.
+opt-level = "s"
diff --git a/lang/rust/wasm-demo/Cargo.toml b/lang/rust/wasm-demo/Cargo.toml
index b2799ef70a6..4dfade68a9c 100644
--- a/lang/rust/wasm-demo/Cargo.toml
+++ b/lang/rust/wasm-demo/Cargo.toml
@@ -42,7 +42,3 @@ wasm-bindgen = "0.2.87"
 [dev-dependencies]
 console_error_panic_hook = { version = "0.1.6" }
 wasm-bindgen-test = "0.3.37"
-
-[profile.release]
-# Tell `rustc` to optimize for small code size.
-opt-level = "s"