diff --git a/src/lib.rs b/src/lib.rs
index 697cec4aed..618ae75557 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -102,10 +102,10 @@ extern crate parity_wasm;
 extern crate byteorder;
 extern crate memory_units as memory_units_crate;
 
-#[cfg(all(not(feature = "32bit_opt_in"), target_pointer_width = "32"))]
+#[cfg(all(not(feature = "opt-in-32bit"), target_pointer_width = "32"))]
 compile_error! {
 "32-bit targets are not supported at the moment.
-You can use '32bit_opt_in' feature.
+You can use 'opt-in-32bit' feature.
 See https://github.com/pepyakin/wasmi/issues/43"
 }