diff --git a/backend/parsers/windmill-parser-csharp/src/lib.rs b/backend/parsers/windmill-parser-csharp/src/lib.rs
index 0ccc4e75cc..0a74273a6c 100644
--- a/backend/parsers/windmill-parser-csharp/src/lib.rs
+++ b/backend/parsers/windmill-parser-csharp/src/lib.rs
@@ -1,4 +1,4 @@
-// #![feature(c_variadic)]
+#![cfg_attr(target_arch = "wasm32", feature(c_variadic))]
 
 #[cfg(target_arch = "wasm32")]
 pub mod wasm_libc;