diff --git a/lib/runtime-c-api/README.md b/lib/runtime-c-api/README.md
index 06e545bf7..39e2c21a9 100644
--- a/lib/runtime-c-api/README.md
+++ b/lib/runtime-c-api/README.md
@@ -112,7 +112,7 @@ rebuild in release mode for the tests to see the changes.
 The tests can be run via `cargo test`, such as:
 
 ```sh
-$ cargo test -- --nocapture
+$ cargo test --release -- --nocapture
 ```
 
 To run tests manually, enter the `lib/runtime-c-api/tests` directory