diff --git a/website/backtrace/Cargo.toml b/website/backtrace/Cargo.toml
index 1c5abfb23..a39f5e828 100644
--- a/website/backtrace/Cargo.toml
+++ b/website/backtrace/Cargo.toml
@@ -26,4 +26,7 @@ wasm-bindgen-test = "0.3"
 
 [profile.release]
 # Tell `rustc` to optimize for small code size.
-opt-level = "s"
\ No newline at end of file
+opt-level = "s"
+
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(wasm_bindgen_unstable_test_coverage)'] }
\ No newline at end of file